Puoi chiedere a un modello Gemini Nano Banana di generare e modificare immagini utilizzando prompt di solo testo e prompt di testo e file. Quando utilizzi Firebase AI Logic, puoi effettuare questa richiesta direttamente dalla tua app.
Con questa funzionalità, puoi eseguire operazioni come:
Genera immagini in modo iterativo tramite una conversazione in linguaggio naturale, regolando le immagini mantenendo la coerenza e il contesto.
Genera immagini con rendering di testo di alta qualità, incluse stringhe di testo lunghe.
Generare output di testo e immagini con interleaving. Ad esempio, un blog post con testo e immagini in un unico turno. In precedenza, ciò richiedeva il collegamento di più modelli.
Genera immagini utilizzando le conoscenze del mondo e le capacità di ragionamento di Gemini.
Puoi configurare la modalità di risposta per la tua richiesta in modo che il modello generi solo immagini o sia immagini che testo. Trova un elenco completo delle funzionalità supportate (insieme a prompt di esempio) più avanti in questa pagina.
Vai al codice per la conversione da testo a immagine Vai al codice per la conversione da video a immagine Vai al codice per testo e immagini intercalati
Vai al codice per la modifica delle immagini Vai al codice per la modifica iterativa delle immagini
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Consulta altre guide per ulteriori opzioni per lavorare con le immagini Analizza le immagini Analizza le immagini on-device Genera output strutturato |
Prima di iniziare
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Fai clic sul tuo provider Gemini API per visualizzare i contenuti e il codice specifici del provider in questa pagina. |
Se non l'hai già fatto, completa la guida introduttiva, che descrive come configurare il progetto Firebase, connettere l'app a Firebase, aggiungere l'SDK, inizializzare il servizio di backend per il provider Gemini API scelto e creare un'istanza GenerativeModel.
Per testare e perfezionare i prompt, ti consigliamo di utilizzare Google AI Studio.
Modelli che supportano questa funzionalità
gemini-nano-banana-2.1(Nano Banana 2.1)gemini-3.1-flash-image(Nano Banana 2)gemini-3.1-flash-lite-image(Nano Banana 2 Lite)gemini-3-pro-image(Nano Banana Pro)
Il modello gemini-2.5-flash-image supporta questa funzionalità, ma è deprecato.
Genera e modifica immagini
Puoi generare e modificare immagini utilizzando un modello Gemini Nano Banana.
Genera immagini (input solo testo)
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Prima di provare questo esempio, completa la sezione Prima di iniziare di questa guida per configurare il progetto e l'app. In questa sezione, farai anche clic su un pulsante per il provider Gemini API scelto, in modo da visualizzare i contenuti specifici del provider in questa pagina. |
Puoi chiedere a un modello Gemini Nano Banana di generare immagini utilizzando un prompt di testo.
Crea un'istanza GenerativeModel,
includi la modalità di risposta di IMAGE nella configurazione del modello
e chiama generateContent.
Swift
import FirebaseAILogic
// Initialize the Gemini Developer API backend service.
// Create a `GenerativeModel` instance with a Gemini model that supports image output.
let model = FirebaseAI.firebaseAI(backend: .googleAI()).generativeModel(
modelName: "gemini-nano-banana-2.1",
// Configure the model to respond with images only.
generationConfig: GenerationConfig(responseModalities: [.image])
)
// Provide a text prompt instructing the model to generate an image
let prompt = "Generate an image of the Eiffel tower with fireworks in the background."
// To generate an image, call `generateContent` with the text input
let response = try await model.generateContent(prompt)
// Handle the generated image
guard let inlineDataPart = response.inlineDataParts.first else {
fatalError("No image data in response.")
}
guard let uiImage = UIImage(data: inlineDataPart.data) else {
fatalError("Failed to convert data to UIImage.")
}
Kotlin
// Initialize the Gemini Developer API backend service.
// Create a `GenerativeModel` instance with a Gemini model that supports image output.
val model = Firebase.ai(backend = GenerativeBackend.googleAI()).generativeModel(
modelName = "gemini-nano-banana-2.1",
// Configure the model to respond with images only.
generationConfig = generationConfig {
responseModalities = listOf(ResponseModality.IMAGE) }
)
// Provide a text prompt instructing the model to generate an image
val prompt = "Generate an image of the Eiffel tower with fireworks in the background."
// To generate image output, call `generateContent` with the text input
val generatedImageAsBitmap = model.generateContent(prompt)
// Handle the generated image
.candidates.first().content.parts.filterIsInstance<ImagePart>().firstOrNull()?.image
Java
// Initialize the Gemini Developer API backend service.
// Create a `GenerativeModel` instance with a Gemini model that supports image output.
GenerativeModel ai = FirebaseAI.getInstance(GenerativeBackend.googleAI()).generativeModel(
"gemini-nano-banana-2.1",
// Configure the model to respond with images only.
new GenerationConfig.Builder()
.setResponseModalities(Arrays.asList(ResponseModality.IMAGE))
.build()
);
GenerativeModelFutures model = GenerativeModelFutures.from(ai);
// Provide a text prompt instructing the model to generate an image
Content prompt = new Content.Builder()
.addText("Generate an image of the Eiffel Tower with fireworks in the background.")
.build();
// To generate an image, call `generateContent` with the text input
ListenableFuture<GenerateContentResponse> response = model.generateContent(prompt);
Futures.addCallback(response, new FutureCallback<GenerateContentResponse>() {
@Override
public void onSuccess(GenerateContentResponse result) {
// iterate over all the parts in the first candidate in the result object
for (Part part : result.getCandidates().get(0).getContent().getParts()) {
if (part instanceof ImagePart) {
ImagePart imagePart = (ImagePart) part;
// The returned image as a bitmap
Bitmap generatedImageAsBitmap = imagePart.getImage();
break;
}
}
}
@Override
public void onFailure(Throwable t) {
t.printStackTrace();
}
}, executor);
Web
import { initializeApp } from "firebase/app";
import { getAI, getGenerativeModel, GoogleAIBackend, ResponseModality } from "firebase/ai";
// TODO(developer): Replace the following with your app's Firebase configuration
// See: https://firebase.google.com/docs/web/learn-more#config-object
const firebaseConfig = {
// ...
};
// Initialize FirebaseApp
const firebaseApp = initializeApp(firebaseConfig);
// Initialize the Gemini Developer API backend service.
const ai = getAI(firebaseApp, { backend: new GoogleAIBackend() });
// Create a `GenerativeModel` instance with a model that supports your use case
const model = getGenerativeModel(ai, {
model: "gemini-nano-banana-2.1",
// Configure the model to respond with images only.
generationConfig: {
responseModalities: [ResponseModality.IMAGE],
},
});
// Provide a text prompt instructing the model to generate an image
const prompt = 'Generate an image of the Eiffel Tower with fireworks in the background.';
// To generate an image, call `generateContent` with the text input
const result = model.generateContent(prompt);
// Handle the generated image
try {
const inlineDataParts = result.response.inlineDataParts();
if (inlineDataParts?.[0]) {
const image = inlineDataParts[0].inlineData;
console.log(image.mimeType, image.data);
}
} catch (err) {
console.error('Prompt or candidate was blocked:', err);
}
Dart
import 'package:firebase_ai/firebase_ai.dart';
import 'package:firebase_core/firebase_core.dart';
import 'firebase_options.dart';
await Firebase.initializeApp(
options: DefaultFirebaseOptions.currentPlatform,
);
// Initialize the Gemini Developer API backend service.
// Create a `GenerativeModel` instance with a Gemini model that supports image output.
final model = FirebaseAI.googleAI().generativeModel(
model: 'gemini-nano-banana-2.1',
// Configure the model to respond with images only.
generationConfig: GenerationConfig(responseModalities: [ResponseModalities.image]),
);
// Provide a text prompt instructing the model to generate an image
final prompt = [Content.text('Generate an image of the Eiffel Tower with fireworks in the background.')];
// To generate an image, call `generateContent` with the text input
final response = await model.generateContent(prompt);
if (response.inlineDataParts.isNotEmpty) {
final imageBytes = response.inlineDataParts[0].bytes;
// Process the image
} else {
// Handle the case where no images were generated
print('Error: No images were generated.');
}
Unity
using Firebase;
using Firebase.AI;
// Initialize the Gemini Developer API backend service.
// Create a `GenerativeModel` instance with a Gemini model that supports image output.
var model = FirebaseAI.GetInstance(FirebaseAI.Backend.GoogleAI()).GetGenerativeModel(
modelName: "gemini-nano-banana-2.1",
// Configure the model to respond with images only.
generationConfig: new GenerationConfig(
responseModalities: new[] { ResponseModality.Image })
);
// Provide a text prompt instructing the model to generate an image
var prompt = "Generate an image of the Eiffel Tower with fireworks in the background.";
// To generate an image, call `GenerateContentAsync` with the text input
var response = await model.GenerateContentAsync(prompt);
// Handle the generated image
var imageParts = response.Candidates.First().Content.Parts
.OfType<ModelContent.InlineDataPart>()
.Where(part => part.MimeType == "image/png");
foreach (var imagePart in imageParts) {
// Load the Image into a Unity Texture2D object
UnityEngine.Texture2D texture2D = new(2, 2);
if (texture2D.LoadImage(imagePart.Data.ToArray())) {
// Do something with the image
}
}
Modifica immagini (input di testo e immagini)
|
Prima di provare questo esempio, completa la sezione Prima di iniziare di questa guida per configurare il progetto e l'app. In questa sezione, farai anche clic su un pulsante per il provider Gemini API scelto, in modo da visualizzare i contenuti specifici del provider in questa pagina. |
Puoi chiedere a un modello Gemini Nano Banana di modificare le immagini utilizzando un prompt con testo e una o più immagini.
Crea un'istanza GenerativeModel,
includi la modalità di risposta di IMAGE nella configurazione del modello
e chiama generateContent.
Swift
import FirebaseAILogic
// Initialize the Gemini Developer API backend service.
// Create a `GenerativeModel` instance with a Gemini model that supports image output.
let model = FirebaseAI.firebaseAI(backend: .googleAI()).generativeModel(
modelName: "gemini-nano-banana-2.1",
// Configure the model to respond with images only.
generationConfig: GenerationConfig(responseModalities: [.image])
)
// Provide an image for the model to edit
guard let image = UIImage(named: "scones") else { fatalError("Image file not found.") }
// Provide a text prompt instructing the model to edit the image
let prompt = "Edit this image to make it look like a cartoon"
// To edit the image, call `generateContent` with the image and text input
let response = try await model.generateContent(image, prompt)
// Handle the generated image
guard let inlineDataPart = response.inlineDataParts.first else {
fatalError("No image data in response.")
}
guard let uiImage = UIImage(data: inlineDataPart.data) else {
fatalError("Failed to convert data to UIImage.")
}
Kotlin
// Initialize the Gemini Developer API backend service.
// Create a `GenerativeModel` instance with a Gemini model that supports image output.
val model = Firebase.ai(backend = GenerativeBackend.googleAI()).generativeModel(
modelName = "gemini-nano-banana-2.1",
// Configure the model to respond with images only.
generationConfig = generationConfig {
responseModalities = listOf(ResponseModality.IMAGE) }
)
// Provide an image for the model to edit
val bitmap = BitmapFactory.decodeResource(context.resources, R.drawable.scones)
// Provide a text prompt instructing the model to edit the image
val prompt = content {
image(bitmap)
text("Edit this image to make it look like a cartoon")
}
// To edit the image, call `generateContent` with the prompt (image and text input)
val generatedImageAsBitmap = model.generateContent(prompt)
// Handle the generated text and image
.candidates.first().content.parts.filterIsInstance<ImagePart>().firstOrNull()?.image
Java
// Initialize the Gemini Developer API backend service.
// Create a `GenerativeModel` instance with a Gemini model that supports image output.
GenerativeModel ai = FirebaseAI.getInstance(GenerativeBackend.googleAI()).generativeModel(
"gemini-nano-banana-2.1",
// Configure the model to respond with images only.
new GenerationConfig.Builder()
.setResponseModalities(Arrays.asList(ResponseModality.IMAGE))
.build()
);
GenerativeModelFutures model = GenerativeModelFutures.from(ai);
// Provide an image for the model to edit
Bitmap bitmap = BitmapFactory.decodeResource(resources, R.drawable.scones);
// Provide a text prompt instructing the model to edit the image
Content promptcontent = new Content.Builder()
.addImage(bitmap)
.addText("Edit this image to make it look like a cartoon")
.build();
// To edit the image, call `generateContent` with the prompt (image and text input)
ListenableFuture<GenerateContentResponse> response = model.generateContent(promptcontent);
Futures.addCallback(response, new FutureCallback<GenerateContentResponse>() {
@Override
public void onSuccess(GenerateContentResponse result) {
// iterate over all the parts in the first candidate in the result object
for (Part part : result.getCandidates().get(0).getContent().getParts()) {
if (part instanceof ImagePart) {
ImagePart imagePart = (ImagePart) part;
Bitmap generatedImageAsBitmap = imagePart.getImage();
break;
}
}
}
@Override
public void onFailure(Throwable t) {
t.printStackTrace();
}
}, executor);
Web
import { initializeApp } from "firebase/app";
import { getAI, getGenerativeModel, GoogleAIBackend, ResponseModality } from "firebase/ai";
// TODO(developer): Replace the following with your app's Firebase configuration
// See: https://firebase.google.com/docs/web/learn-more#config-object
const firebaseConfig = {
// ...
};
// Initialize FirebaseApp
const firebaseApp = initializeApp(firebaseConfig);
// Initialize the Gemini Developer API backend service.
const ai = getAI(firebaseApp, { backend: new GoogleAIBackend() });
// Create a `GenerativeModel` instance with a model that supports your use case
const model = getGenerativeModel(ai, {
model: "gemini-nano-banana-2.1",
// Configure the model to respond with images only.
generationConfig: {
responseModalities: [ResponseModality.IMAGE],
},
});
// Prepare an image for the model to edit
async function fileToGenerativePart(file) {
const base64EncodedDataPromise = new Promise((resolve) => {
const reader = new FileReader();
reader.onloadend = () => resolve(reader.result.split(',')[1]);
reader.readAsDataURL(file);
});
return {
type: "inlineData",
inlineData: { data: await base64EncodedDataPromise, mimeType: file.type },
};
}
// Provide a text prompt instructing the model to edit the image
const prompt = "Edit this image to make it look like a cartoon";
const fileInputEl = document.querySelector("input[type=file]");
const imagePart = await fileToGenerativePart(fileInputEl.files[0]);
// To edit the image, call `generateContent` with the image and text input
const result = await model.generateContent([prompt, imagePart]);
// Handle the generated image
try {
const inlineDataParts = result.response.inlineDataParts();
if (inlineDataParts?.[0]) {
const image = inlineDataParts[0].inlineData;
console.log(image.mimeType, image.data);
}
} catch (err) {
console.error('Prompt or candidate was blocked:', err);
}
Dart
import 'package:firebase_ai/firebase_ai.dart';
import 'package:firebase_core/firebase_core.dart';
import 'firebase_options.dart';
await Firebase.initializeApp(
options: DefaultFirebaseOptions.currentPlatform,
);
// Initialize the Gemini Developer API backend service.
// Create a `GenerativeModel` instance with a Gemini model that supports image output.
final model = FirebaseAI.googleAI().generativeModel(
model: 'gemini-nano-banana-2.1',
// Configure the model to respond with images only.
generationConfig: GenerationConfig(responseModalities: [ResponseModalities.image]),
);
// Prepare an image for the model to edit
final image = await File('scones.jpg').readAsBytes();
final imagePart = InlineDataPart('image/jpeg', image);
// Provide a text prompt instructing the model to edit the image
final prompt = TextPart("Edit this image to make it look like a cartoon");
// To edit the image, call `generateContent` with the image and text input
final response = await model.generateContent([
Content.multi([prompt,imagePart])
]);
// Handle the generated image
if (response.inlineDataParts.isNotEmpty) {
final imageBytes = response.inlineDataParts[0].bytes;
// Process the image
} else {
// Handle the case where no images were generated
print('Error: No images were generated.');
}
Unity
using Firebase;
using Firebase.AI;
// Initialize the Gemini Developer API backend service.
// Create a `GenerativeModel` instance with a Gemini model that supports image output.
var model = FirebaseAI.GetInstance(FirebaseAI.Backend.GoogleAI()).GetGenerativeModel(
modelName: "gemini-nano-banana-2.1",
// Configure the model to respond with images only.
generationConfig: new GenerationConfig(
responseModalities: new[] { ResponseModality.Image })
);
// Prepare an image for the model to edit
var imageFile = System.IO.File.ReadAllBytes(System.IO.Path.Combine(
UnityEngine.Application.streamingAssetsPath, "scones.jpg"));
var image = ModelContent.InlineData("image/jpeg", imageFile);
// Provide a text prompt instructing the model to edit the image
var prompt = ModelContent.Text("Edit this image to make it look like a cartoon.");
// To edit the image, call `GenerateContent` with the image and text input
var response = await model.GenerateContentAsync(new [] { prompt, image });
// Handle the generated image
var imageParts = response.Candidates.First().Content.Parts
.OfType<ModelContent.InlineDataPart>()
.Where(part => part.MimeType == "image/png");
foreach (var imagePart in imageParts) {
// Load the Image into a Unity Texture2D object
Texture2D texture2D = new Texture2D(2, 2);
if (texture2D.LoadImage(imagePart.Data.ToArray())) {
// Do something with the image
}
}
Genera immagini da input video (input di testo e video)
|
Prima di provare questo esempio, completa la sezione Prima di iniziare di questa guida per configurare il progetto e l'app. In questa sezione, farai anche clic su un pulsante per il provider Gemini API scelto, in modo da visualizzare i contenuti specifici del provider in questa pagina. |
Puoi chiedere a un modello Gemini Nano Banana di generare immagini utilizzando un prompt con testo e un video.
Crea un'istanza GenerativeModel,
includi la modalità di risposta di IMAGE nella configurazione del modello
e chiama generateContent.
Swift
import FirebaseAILogic
// Initialize the Gemini Developer API backend service.
// Create a `GenerativeModel` instance with a Gemini model that supports image output.
let model = FirebaseAI.firebaseAI(backend: .googleAI()).generativeModel(
modelName: "gemini-nano-banana-2.1",
// Configure the model to respond with images only.
generationConfig: GenerationConfig(responseModalities: [.image])
)
// Provide the video as `Data` with the appropriate MIME type.
let video = InlineDataPart(data: try Data(contentsOf: videoURL), mimeType: "video/mp4")
// Provide a text prompt instructing the model to generate an image.
let prompt = "Generate a poster image that captures the key themes of this video."
// To generate an image, call `generateContent` with the video and text input.
let response = try await model.generateContent(video, prompt)
// Handle the generated image.
guard let inlineDataPart = response.inlineDataParts.first else {
fatalError("No image data in response.")
}
guard let uiImage = UIImage(data: inlineDataPart.data) else {
fatalError("Failed to convert data to UIImage.")
}
Kotlin
// Initialize the Gemini Developer API backend service.
// Create a `GenerativeModel` instance with a Gemini model that supports image output.
val model = Firebase.ai(backend = GenerativeBackend.googleAI()).generativeModel(
modelName = "gemini-nano-banana-2.1",
// Configure the model to respond with images only.
generationConfig = generationConfig {
responseModalities = listOf(ResponseModality.IMAGE) }
)
val contentResolver = applicationContext.contentResolver
contentResolver.openInputStream(videoUri).use { stream ->
stream?.let {
val bytes = stream.readBytes()
// Provide a prompt that includes the video specified above and text.
val prompt = content {
inlineData(bytes, "video/mp4")
text("Generate a poster image that captures the key themes of this video.")
}
// Call generateContent with the prompt (video and text input).
val response = model.generateContent(prompt)
// Handle the generated image.
val generatedImageAsBitmap = response.candidates.first().content.parts
.filterIsInstance<ImagePart>().firstOrNull()?.image
}
}
Java
// Initialize the Gemini Developer API backend service.
// Create a `GenerativeModel` instance with a Gemini model that supports image output.
GenerativeModel ai = FirebaseAI.getInstance(GenerativeBackend.googleAI()).generativeModel(
"gemini-nano-banana-2.1",
// Configure the model to respond with images only.
new GenerationConfig.Builder()
.setResponseModalities(Arrays.asList(ResponseModality.IMAGE))
.build()
);
GenerativeModelFutures model = GenerativeModelFutures.from(ai);
ContentResolver resolver = getApplicationContext().getContentResolver();
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
try (java.io.InputStream inputStream = resolver.openInputStream(videoUri)) {
if (inputStream != null) {
int bytesRead;
byte[] buffer = new byte[16384];
while ((bytesRead = inputStream.read(buffer)) != -1) {
byteArrayOutputStream.write(buffer, 0, bytesRead);
}
}
} catch (IOException e) {
e.printStackTrace();
}
// Provide a prompt that includes the video specified above and text.
Content promptContent = new Content.Builder()
.addInlineData(byteArrayOutputStream.toByteArray(), "video/mp4")
.addText("Generate a poster image that captures the key themes of this video.")
.build();
// Call generateContent with the prompt (video and text input).
ListenableFuture<GenerateContentResponse> response = model.generateContent(promptContent);
Futures.addCallback(response, new FutureCallback<GenerateContentResponse>() {
@Override
public void onSuccess(GenerateContentResponse result) {
// We didn't get any images back from the model.
if (result.getCandidates().isEmpty()) {
return;
}
// Handle the generated image.
for (Part part : result.getCandidates().get(0).getContent().getParts()) {
if (part instanceof ImagePart) {
ImagePart imagePart = (ImagePart) part;
Bitmap generatedImageAsBitmap = imagePart.getImage();
break;
}
}
}
@Override
public void onFailure(Throwable t) {
t.printStackTrace();
}
}, executor);
Web
import { initializeApp } from "firebase/app";
import { getAI, getGenerativeModel, GoogleAIBackend, ResponseModality } from "firebase/ai";
// TODO(developer): Replace the following with your app's Firebase configuration
// See: https://firebase.google.com/docs/web/learn-more#config-object
const firebaseConfig = {
// ...
};
// Initialize FirebaseApp
const firebaseApp = initializeApp(firebaseConfig);
// Initialize the Gemini Developer API backend service.
const ai = getAI(firebaseApp, { backend: new GoogleAIBackend() });
// Create a `GenerativeModel` instance with a model that supports your use case
const model = getGenerativeModel(ai, {
model: "gemini-nano-banana-2.1",
// Configure the model to respond with images only.
generationConfig: {
responseModalities: [ResponseModality.IMAGE],
},
});
// Converts a File object to a Part object.
async function fileToGenerativePart(file) {
const base64EncodedDataPromise = new Promise((resolve) => {
const reader = new FileReader();
reader.onloadend = () => resolve(reader.result.split(',')[1]);
reader.readAsDataURL(file);
});
return {
inlineData: { data: await base64EncodedDataPromise, mimeType: file.type },
};
}
async function run() {
// Provide a text prompt instructing the model to generate an image.
const prompt = "Generate a poster image that captures the key themes of this video.";
const fileInputEl = document.querySelector("input[type=file]");
const videoPart = await fileToGenerativePart(fileInputEl.files[0]);
// Call generateContent with the video and text input.
const result = await model.generateContent([prompt, videoPart]);
// Handle the generated image.
try {
const inlineDataParts = result.response.inlineDataParts();
if (inlineDataParts?.[0]) {
const image = inlineDataParts[0].inlineData;
console.log(image.mimeType, image.data);
}
} catch (err) {
console.error('Prompt or candidate was blocked:', err);
}
}
run();
Dart
import 'package:firebase_ai/firebase_ai.dart';
import 'package:firebase_core/firebase_core.dart';
import 'firebase_options.dart';
await Firebase.initializeApp(
options: DefaultFirebaseOptions.currentPlatform,
);
// Initialize the Gemini Developer API backend service.
// Create a `GenerativeModel` instance with a Gemini model that supports image output.
final model = FirebaseAI.googleAI().generativeModel(
model: 'gemini-nano-banana-2.1',
// Configure the model to respond with images only.
generationConfig: GenerationConfig(responseModalities: [ResponseModalities.image]),
);
// Prepare video for input.
final video = await File('video0.mp4').readAsBytes();
final videoPart = InlineDataPart('video/mp4', video);
// Provide a text prompt instructing the model to generate an image.
final prompt = TextPart("Generate a poster image that captures the key themes of this video.");
// Call generateContent with the video and text input.
final response = await model.generateContent([
Content.multi([prompt, videoPart])
]);
// Handle the generated image.
if (response.inlineDataParts.isNotEmpty) {
final imageBytes = response.inlineDataParts.first.bytes;
// Process the image.
} else {
// Handle the case where no images were generated.
print('Error: No images were generated.');
}
Unity
using Firebase;
using Firebase.AI;
// Initialize the Gemini Developer API backend service.
// Create a `GenerativeModel` instance with a Gemini model that supports image output.
var model = FirebaseAI.GetInstance(FirebaseAI.Backend.GoogleAI()).GetGenerativeModel(
modelName: "gemini-nano-banana-2.1",
// Configure the model to respond with images only.
generationConfig: new GenerationConfig(
responseModalities: new[] { ResponseModality.Image })
);
// Prepare a video for input.
var videoFile = System.IO.File.ReadAllBytes(System.IO.Path.Combine(
UnityEngine.Application.streamingAssetsPath, "yourVideo.mp4"));
var video = ModelContent.InlineData("video/mp4", videoFile);
// Provide a text prompt instructing the model to generate an image.
var prompt = ModelContent.Text("Generate a poster image that captures the key themes of this video.");
// Call GenerateContentAsync with the video and text input.
var response = await model.GenerateContentAsync(new [] { prompt, video });
// Handle the generated image.
var imageParts = response.Candidates.First().Content.Parts
.OfType<ModelContent.InlineDataPart>()
.Where(part => part.MimeType == "image/png");
foreach (var imagePart in imageParts) {
// Load the Image into a Unity Texture2D object.
Texture2D texture2D = new Texture2D(2, 2);
if (texture2D.LoadImage(imagePart.Data.ToArray())) {
// Do something with the image.
}
}
Genera testo e immagini integrati
|
Prima di provare questo esempio, completa la sezione Prima di iniziare di questa guida per configurare il progetto e l'app. In questa sezione, farai anche clic su un pulsante per il provider Gemini API scelto, in modo da visualizzare i contenuti specifici del provider in questa pagina. |
Puoi chiedere a un modello Gemini Nano Banana di generare immagini integrate con le sue risposte di testo. Ad esempio, puoi generare immagini di come potrebbe apparire ogni passaggio di una ricetta generata insieme alle istruzioni del passaggio, senza dover effettuare richieste separate al modello o a modelli diversi.
Crea un'istanza GenerativeModel,
includi le modalità di risposta TEXT e IMAGE nella configurazione del modello
e chiama generateContent.
Swift
import FirebaseAILogic
// Initialize the Gemini Developer API backend service.
// Create a `GenerativeModel` instance with a Gemini model that supports image output.
let model = FirebaseAI.firebaseAI(backend: .googleAI()).generativeModel(
modelName: "gemini-nano-banana-2.1",
// Configure the model to respond with text and images.
generationConfig: GenerationConfig(responseModalities: [.text, .image])
)
// Provide a text prompt instructing the model to generate interleaved text and images
let prompt = """
Generate an illustrated recipe for a paella.
Create images to go alongside the text as you generate the recipe
"""
// To generate interleaved text and images, call `generateContent` with the text input
let response = try await model.generateContent(prompt)
// Handle the generated text and image
guard let candidate = response.candidates.first else {
fatalError("No candidates in response.")
}
for part in candidate.content.parts {
switch part {
case let textPart as TextPart:
// Do something with the generated text
let text = textPart.text
case let inlineDataPart as InlineDataPart:
// Do something with the generated image
guard let uiImage = UIImage(data: inlineDataPart.data) else {
fatalError("Failed to convert data to UIImage.")
}
default:
fatalError("Unsupported part type: \(part)")
}
}
Kotlin
// Initialize the Gemini Developer API backend service.
// Create a `GenerativeModel` instance with a Gemini model that supports image output.
val model = Firebase.ai(backend = GenerativeBackend.googleAI()).generativeModel(
modelName = "gemini-nano-banana-2.1",
// Configure the model to respond with text and images.
generationConfig = generationConfig {
responseModalities = listOf(ResponseModality.TEXT, ResponseModality.IMAGE) }
)
// Provide a text prompt instructing the model to generate interleaved text and images
val prompt = """
Generate an illustrated recipe for a paella.
Create images to go alongside the text as you generate the recipe
""".trimIndent()
// To generate interleaved text and images, call `generateContent` with the text input
val responseContent = model.generateContent(prompt).candidates.first().content
// The response will contain image and text parts interleaved
for (part in responseContent.parts) {
when (part) {
is ImagePart -> {
// ImagePart as a bitmap
val generatedImageAsBitmap: Bitmap? = part.asImageOrNull()
}
is TextPart -> {
// Text content from the TextPart
val text = part.text
}
}
}
Java
// Initialize the Gemini Developer API backend service.
// Create a `GenerativeModel` instance with a Gemini model that supports image output.
GenerativeModel ai = FirebaseAI.getInstance(GenerativeBackend.googleAI()).generativeModel(
"gemini-nano-banana-2.1",
// Configure the model to respond with text and images.
new GenerationConfig.Builder()
.setResponseModalities(Arrays.asList(ResponseModality.TEXT, ResponseModality.IMAGE))
.build()
);
GenerativeModelFutures model = GenerativeModelFutures.from(ai);
// Provide a text prompt instructing the model to generate interleaved text and images
Content prompt = new Content.Builder()
.addText("Generate an illustrated recipe for a paella.\n" +
"Create images to go alongside the text as you generate the recipe")
.build();
// To generate interleaved text and images, call `generateContent` with the text input
ListenableFuture<GenerateContentResponse> response = model.generateContent(prompt);
Futures.addCallback(response, new FutureCallback<GenerateContentResponse>() {
@Override
public void onSuccess(GenerateContentResponse result) {
Content responseContent = result.getCandidates().get(0).getContent();
// The response will contain image and text parts interleaved
for (Part part : responseContent.getParts()) {
if (part instanceof ImagePart) {
// ImagePart as a bitmap
Bitmap generatedImageAsBitmap = ((ImagePart) part).getImage();
} else if (part instanceof TextPart){
// Text content from the TextPart
String text = ((TextPart) part).getText();
}
}
}
@Override
public void onFailure(Throwable t) {
System.err.println(t);
}
}, executor);
Web
import { initializeApp } from "firebase/app";
import { getAI, getGenerativeModel, GoogleAIBackend, ResponseModality } from "firebase/ai";
// TODO(developer): Replace the following with your app's Firebase configuration
// See: https://firebase.google.com/docs/web/learn-more#config-object
const firebaseConfig = {
// ...
};
// Initialize FirebaseApp
const firebaseApp = initializeApp(firebaseConfig);
// Initialize the Gemini Developer API backend service.
const ai = getAI(firebaseApp, { backend: new GoogleAIBackend() });
// Create a `GenerativeModel` instance with a model that supports your use case
const model = getGenerativeModel(ai, {
model: "gemini-nano-banana-2.1",
// Configure the model to respond with text and images.
generationConfig: {
responseModalities: [ResponseModality.TEXT, ResponseModality.IMAGE],
},
});
// Provide a text prompt instructing the model to generate interleaved text and images
const prompt = 'Generate an illustrated recipe for a paella.\n.' +
'Create images to go alongside the text as you generate the recipe';
// To generate interleaved text and images, call `generateContent` with the text input
const result = await model.generateContent(prompt);
// Handle the generated text and image
try {
const response = result.response;
if (response.candidates?.[0].content?.parts) {
for (const part of response.candidates?.[0].content?.parts) {
if (part.type === "text") {
// Do something with the text
console.log(part.text);
}
if (part.type === "inlineData") {
// Do something with the image
const image = part.inlineData;
console.log(image.mimeType, image.data);
}
}
}
} catch (err) {
console.error('Prompt or candidate was blocked:', err);
}
Dart
import 'package:firebase_ai/firebase_ai.dart';
import 'package:firebase_core/firebase_core.dart';
import 'firebase_options.dart';
await Firebase.initializeApp(
options: DefaultFirebaseOptions.currentPlatform,
);
// Initialize the Gemini Developer API backend service.
// Create a `GenerativeModel` instance with a Gemini model that supports image output.
final model = FirebaseAI.googleAI().generativeModel(
model: 'gemini-nano-banana-2.1',
// Configure the model to respond with text and images.
generationConfig: GenerationConfig(responseModalities: [ResponseModalities.text, ResponseModalities.image]),
);
// Provide a text prompt instructing the model to generate interleaved text and images
final prompt = [Content.text(
'Generate an illustrated recipe for a paella\n ' +
'Create images to go alongside the text as you generate the recipe'
)];
// To generate interleaved text and images, call `generateContent` with the text input
final response = await model.generateContent(prompt);
// Handle the generated text and image
final parts = response.candidates.firstOrNull?.content.parts;
if (parts != null && parts.isNotEmpty) {
for (final part in parts) {
if (part is TextPart) {
// Do something with text part
final text = part.text;
}
if (part is InlineDataPart) {
// Process image
final imageBytes = part.bytes;
}
}
} else {
// Handle the case where no images were generated
print('Error: No images were generated.');
}
Unity
using Firebase;
using Firebase.AI;
// Initialize the Gemini Developer API backend service.
// Create a `GenerativeModel` instance with a Gemini model that supports image output.
var model = FirebaseAI.GetInstance(FirebaseAI.Backend.GoogleAI()).GetGenerativeModel(
modelName: "gemini-nano-banana-2.1",
// Configure the model to respond with text and images.
generationConfig: new GenerationConfig(
responseModalities: new[] { ResponseModality.Text, ResponseModality.Image })
);
// Provide a text prompt instructing the model to generate interleaved text and images
var prompt = "Generate an illustrated recipe for a paella \n" +
"Create images to go alongside the text as you generate the recipe";
// To generate interleaved text and images, call `GenerateContentAsync` with the text input
var response = await model.GenerateContentAsync(prompt);
// Handle the generated text and image
foreach (var part in response.Candidates.First().Content.Parts) {
if (part is ModelContent.TextPart textPart) {
if (!string.IsNullOrWhiteSpace(textPart.Text)) {
// Do something with the text
}
} else if (part is ModelContent.InlineDataPart dataPart) {
if (dataPart.MimeType == "image/png") {
// Load the Image into a Unity Texture2D object
UnityEngine.Texture2D texture2D = new(2, 2);
if (texture2D.LoadImage(dataPart.Data.ToArray())) {
// Do something with the image
}
}
}
}
Esegui l'iterazione e modifica le immagini utilizzando la chat a più turni
|
Prima di provare questo esempio, completa la sezione Prima di iniziare di questa guida per configurare il progetto e l'app. In questa sezione, farai anche clic su un pulsante per il provider Gemini API scelto, in modo da visualizzare i contenuti specifici del provider in questa pagina. |
Utilizzando la chat a più turni, puoi interagire con un modello Gemini Nano Banana sulle immagini che genera o che fornisci.
Crea un'istanza GenerativeModel,
includi la modalità di risposta IMAGE nella configurazione del modello
e chiama startChat() e sendMessage() per inviare nuovi messaggi utente.
Swift
import FirebaseAILogic
// Initialize the Gemini Developer API backend service.
// Create a `GenerativeModel` instance with a Gemini model that supports image output.
let model = FirebaseAI.firebaseAI(backend: .googleAI()).generativeModel(
modelName: "gemini-nano-banana-2.1",
// Configure the model to respond with images only.
generationConfig: GenerationConfig(responseModalities: [.image])
)
// Initialize the chat
let chat = model.startChat()
guard let image = UIImage(named: "scones") else { fatalError("Image file not found.") }
// Provide an initial text prompt instructing the model to edit the image
let prompt = "Edit this image to make it look like a cartoon"
// To generate an initial response, send a user message with the image and text prompt
let response = try await chat.sendMessage(image, prompt)
// Inspect the generated image
guard let inlineDataPart = response.inlineDataParts.first else {
fatalError("No image data in response.")
}
guard let uiImage = UIImage(data: inlineDataPart.data) else {
fatalError("Failed to convert data to UIImage.")
}
// Follow up requests do not need to specify the image again
let followUpResponse = try await chat.sendMessage("But make it old-school line drawing style")
// Inspect the edited image after the follow up request
guard let followUpInlineDataPart = followUpResponse.inlineDataParts.first else {
fatalError("No image data in response.")
}
guard let followUpUIImage = UIImage(data: followUpInlineDataPart.data) else {
fatalError("Failed to convert data to UIImage.")
}
Kotlin
// Initialize the Gemini Developer API backend service.
// Create a `GenerativeModel` instance with a Gemini model that supports image output.
val model = Firebase.ai(backend = GenerativeBackend.googleAI()).generativeModel(
modelName = "gemini-nano-banana-2.1",
// Configure the model to respond with images only.
generationConfig = generationConfig {
responseModalities = listOf(ResponseModality.IMAGE) }
)
// Provide an image for the model to edit
val bitmap = BitmapFactory.decodeResource(context.resources, R.drawable.scones)
// Create the initial prompt instructing the model to edit the image
val prompt = content {
image(bitmap)
text("Edit this image to make it look like a cartoon")
}
// Initialize the chat
val chat = model.startChat()
// To generate an initial response, send a user message with the image and text prompt
var response = chat.sendMessage(prompt)
// Inspect the returned image
var generatedImageAsBitmap = response
.candidates.first().content.parts.filterIsInstance<ImagePart>().firstOrNull()?.image
// Follow up requests do not need to specify the image again
response = chat.sendMessage("But make it old-school line drawing style")
generatedImageAsBitmap = response
.candidates.first().content.parts.filterIsInstance<ImagePart>().firstOrNull()?.image
Java
// Initialize the Gemini Developer API backend service.
// Create a `GenerativeModel` instance with a Gemini model that supports image output.
GenerativeModel ai = FirebaseAI.getInstance(GenerativeBackend.googleAI()).generativeModel(
"gemini-nano-banana-2.1",
// Configure the model to respond with images only.
new GenerationConfig.Builder()
.setResponseModalities(Arrays.asList(ResponseModality.IMAGE))
.build()
);
GenerativeModelFutures model = GenerativeModelFutures.from(ai);
// Provide an image for the model to edit
Bitmap bitmap = BitmapFactory.decodeResource(resources, R.drawable.scones);
// Initialize the chat
ChatFutures chat = model.startChat();
// Create the initial prompt instructing the model to edit the image
Content prompt = new Content.Builder()
.setRole("user")
.addImage(bitmap)
.addText("Edit this image to make it look like a cartoon")
.build();
// To generate an initial response, send a user message with the image and text prompt
ListenableFuture<GenerateContentResponse> response = chat.sendMessage(prompt);
// Extract the image from the initial response
ListenableFuture<@Nullable Bitmap> initialRequest = Futures.transform(response, result -> {
for (Part part : result.getCandidates().get(0).getContent().getParts()) {
if (part instanceof ImagePart) {
ImagePart imagePart = (ImagePart) part;
return imagePart.getImage();
}
}
return null;
}, executor);
// Follow up requests do not need to specify the image again
ListenableFuture<GenerateContentResponse> modelResponseFuture = Futures.transformAsync(
initialRequest,
generatedImage -> {
Content followUpPrompt = new Content.Builder()
.addText("But make it old-school line drawing style")
.build();
return chat.sendMessage(followUpPrompt);
},
executor);
// Add a final callback to check the reworked image
Futures.addCallback(modelResponseFuture, new FutureCallback<GenerateContentResponse>() {
@Override
public void onSuccess(GenerateContentResponse result) {
for (Part part : result.getCandidates().get(0).getContent().getParts()) {
if (part instanceof ImagePart) {
ImagePart imagePart = (ImagePart) part;
Bitmap generatedImageAsBitmap = imagePart.getImage();
break;
}
}
}
@Override
public void onFailure(Throwable t) {
t.printStackTrace();
}
}, executor);
Web
import { initializeApp } from "firebase/app";
import { getAI, getGenerativeModel, GoogleAIBackend, ResponseModality } from "firebase/ai";
// TODO(developer): Replace the following with your app's Firebase configuration
// See: https://firebase.google.com/docs/web/learn-more#config-object
const firebaseConfig = {
// ...
};
// Initialize FirebaseApp
const firebaseApp = initializeApp(firebaseConfig);
// Initialize the Gemini Developer API backend service.
const ai = getAI(firebaseApp, { backend: new GoogleAIBackend() });
// Create a `GenerativeModel` instance with a model that supports your use case
const model = getGenerativeModel(ai, {
model: "gemini-nano-banana-2.1",
// Configure the model to respond with images only.
generationConfig: {
responseModalities: [ResponseModality.IMAGE],
},
});
// Prepare an image for the model to edit
async function fileToGenerativePart(file) {
const base64EncodedDataPromise = new Promise((resolve) => {
const reader = new FileReader();
reader.onloadend = () => resolve(reader.result.split(',')[1]);
reader.readAsDataURL(file);
});
return {
type: "inlineData",
inlineData: { data: await base64EncodedDataPromise, mimeType: file.type },
};
}
const fileInputEl = document.querySelector("input[type=file]");
const imagePart = await fileToGenerativePart(fileInputEl.files[0]);
// Provide an initial text prompt instructing the model to edit the image
const prompt = "Edit this image to make it look like a cartoon";
// Initialize the chat
const chat = model.startChat();
// To generate an initial response, send a user message with the image and text prompt
const result = await chat.sendMessage([prompt, imagePart]);
// Request and inspect the generated image
try {
const inlineDataParts = result.response.inlineDataParts();
if (inlineDataParts?.[0]) {
// Inspect the generated image
const image = inlineDataParts[0].inlineData;
console.log(image.mimeType, image.data);
}
} catch (err) {
console.error('Prompt or candidate was blocked:', err);
}
// Follow up requests do not need to specify the image again
const followUpResult = await chat.sendMessage("But make it old-school line drawing style");
// Request and inspect the returned image
try {
const followUpInlineDataParts = followUpResult.response.inlineDataParts();
if (followUpInlineDataParts?.[0]) {
// Inspect the generated image
const followUpImage = followUpInlineDataParts[0].inlineData;
console.log(followUpImage.mimeType, followUpImage.data);
}
} catch (err) {
console.error('Prompt or candidate was blocked:', err);
}
Dart
import 'package:firebase_ai/firebase_ai.dart';
import 'package:firebase_core/firebase_core.dart';
import 'firebase_options.dart';
await Firebase.initializeApp(
options: DefaultFirebaseOptions.currentPlatform,
);
// Initialize the Gemini Developer API backend service.
// Create a `GenerativeModel` instance with a Gemini model that supports image output.
final model = FirebaseAI.googleAI().generativeModel(
model: 'gemini-nano-banana-2.1',
// Configure the model to respond with images only.
generationConfig: GenerationConfig(responseModalities: [ResponseModalities.image]),
);
// Prepare an image for the model to edit
final image = await File('scones.jpg').readAsBytes();
final imagePart = InlineDataPart('image/jpeg', image);
// Provide an initial text prompt instructing the model to edit the image
final prompt = TextPart("Edit this image to make it look like a cartoon");
// Initialize the chat
final chat = model.startChat();
// To generate an initial response, send a user message with the image and text prompt
final response = await chat.sendMessage([
Content.multi([prompt,imagePart])
]);
// Inspect the returned image
if (response.inlineDataParts.isNotEmpty) {
final imageBytes = response.inlineDataParts[0].bytes;
// Process the image
} else {
// Handle the case where no images were generated
print('Error: No images were generated.');
}
// Follow up requests do not need to specify the image again
final followUpResponse = await chat.sendMessage([
Content.text("But make it old-school line drawing style")
]);
// Inspect the returned image
if (followUpResponse.inlineDataParts.isNotEmpty) {
final followUpImageBytes = response.inlineDataParts[0].bytes;
// Process the image
} else {
// Handle the case where no images were generated
print('Error: No images were generated.');
}
Unity
using Firebase;
using Firebase.AI;
// Initialize the Gemini Developer API backend service.
// Create a `GenerativeModel` instance with a Gemini model that supports image output.
var model = FirebaseAI.GetInstance(FirebaseAI.Backend.GoogleAI()).GetGenerativeModel(
modelName: "gemini-nano-banana-2.1",
// Configure the model to respond with images only.
generationConfig: new GenerationConfig(
responseModalities: new[] { ResponseModality.Image })
);
// Prepare an image for the model to edit
var imageFile = System.IO.File.ReadAllBytes(System.IO.Path.Combine(
UnityEngine.Application.streamingAssetsPath, "scones.jpg"));
var image = ModelContent.InlineData("image/jpeg", imageFile);
// Provide an initial text prompt instructing the model to edit the image
var prompt = ModelContent.Text("Edit this image to make it look like a cartoon.");
// Initialize the chat
var chat = model.StartChat();
// To generate an initial response, send a user message with the image and text prompt
var response = await chat.SendMessageAsync(new [] { prompt, image });
// Inspect the returned image
var imageParts = response.Candidates.First().Content.Parts
.OfType<ModelContent.InlineDataPart>()
.Where(part => part.MimeType == "image/png");
// Load the image into a Unity Texture2D object
UnityEngine.Texture2D texture2D = new(2, 2);
if (texture2D.LoadImage(imageParts.First().Data.ToArray())) {
// Do something with the image
}
// Follow up requests do not need to specify the image again
var followUpResponse = await chat.SendMessageAsync("But make it old-school line drawing style");
// Inspect the returned image
var followUpImageParts = followUpResponse.Candidates.First().Content.Parts
.OfType<ModelContent.InlineDataPart>()
.Where(part => part.MimeType == "image/png");
// Load the image into a Unity Texture2D object
UnityEngine.Texture2D followUpTexture2D = new(2, 2);
if (followUpTexture2D.LoadImage(followUpImageParts.First().Data.ToArray())) {
// Do something with the image
}
Fornisci immagini di riferimento
I modelli Gemini Nano Banana ti consentono di fornire immagini di riferimento nel prompt. Queste immagini possono includere:
Gemini Nano Banana 2.1 (
gemini-nano-banana-2.1):- Fino a 10 immagini di oggetti ad alta fedeltà da includere nell'immagine finale
- Fino a 4 immagini di personaggi per mantenere la coerenza dell'identità
Gemini Nano Banana 2 (
gemini-3.1-flash-image):- Fino a 10 immagini di oggetti ad alta fedeltà da includere nell'immagine finale
- Fino a 4 immagini di personaggi per mantenere la coerenza dell'identità
Gemini Nano Banana 2 Lite (
gemini-3.1-flash-lite-image):- Fino a 10 immagini di oggetti ad alta fedeltà da includere nell'immagine finale
- Fino a 4 immagini di personaggi per mantenere la coerenza dell'identità
Gemini Nano Banana Pro (
gemini-3-pro-image)- Fino a 6 immagini di oggetti ad alta fedeltà da includere nell'immagine finale
- Fino a 5 immagini di personaggi per mantenere la coerenza dell'identità
- Fino a 3 immagini da utilizzare come riferimenti di stile
Tieni presente che il modello gemini-2.5-flash-image supporta solo fino a 3 immagini.
Configura la generazione di immagini
Per impostazione predefinita, i modelli Gemini Nano Banana generano immagini quadrate (proporzioni 1:1) con una risoluzione di 1024 x 1024. Puoi personalizzare l'output delle immagini create dall'AI utilizzando la proprietà imageConfig all'interno di generationConfig.
Ad esempio, puoi configurare l'immagine di output utilizzando gli enum delle proporzioni e delle dimensioni dell'immagine (ad esempio, proporzioni 16:9 e risoluzione 2K, con un'immagine di 2752 x 1536), in questo modo:
Swift
// ...
// Specify aspect ratio and image size (both optional) in an image config.
let imageConfig = ImageConfig(aspectRatio: .landscape16x9, imageSize: .size2K)
let generationConfig = GenerationConfig(
// Configure the model to respond with text (optional) and images (required).
// Include the text modality only if you want interleaved text and images in the response.
responseModalities: [.text, .image],
imageConfig: imageConfig
)
// Make sure you initialize your chosen Gemini API backend service
let model = FirebaseAI.firebaseAI().generativeModel(
modelName: "gemini-nano-banana-2.1",
generationConfig: generationConfig
)
// ...
Kotlin
// ...
val config = generationConfig {
// Configure the model to respond with text (optional) and images (required).
// Include the text modality only if you want interleaved text and images in the response.
responseModalities = listOf(ResponseModality.TEXT, ResponseModality.IMAGE)
// Specify aspect ratio and image size (both optional) in an image config.
imageConfig = imageConfig {
aspectRatio = AspectRatio.LANDSCAPE_16x9
imageSize = ImageSize.SIZE_2K
}
}
// Make sure you initialize your chosen Gemini API backend service
val model = Firebase.ai.generativeModel(
modelName = "gemini-nano-banana-2.1",
generationConfig = config
)
// ...
Java
// ...
GenerationConfig config = new GenerationConfig.Builder()
// Configure the model to respond with text (optional) and images (required).
// Include the text modality only if you want interleaved text and images in the response.
.setResponseModalities(Arrays.asList(ResponseModality.TEXT, ResponseModality.IMAGE))
// Specify aspect ratio and image size (both optional) in an image config.
.setImageConfig(
ImageConfig.builder()
.setAspectRatio(AspectRatio.LANDSCAPE_16x9)
.setImageSize(ImageSize.SIZE_2K)
.build()
)
.build();
// Make sure you initialize your chosen Gemini API backend service
GenerativeModel model = FirebaseAI.getInstance().generativeModel(
"gemini-nano-banana-2.1",
config
);
// ...
Web
import {
getGenerativeModel,
ResponseModality,
ImageConfigAspectRatio,
ImageConfigImageSize
} from "firebase/ai";
// ...
const generationConfig = {
// Configure the model to respond with text (optional) and images (required).
// Include the text modality only if you want interleaved text and images in the response.
responseModalities: [ResponseModality.TEXT, ResponseModality.IMAGE],
// Specify aspect ratio and image size (both optional) in an image config.
imageConfig: {
aspectRatio: ImageConfigAspectRatio.LANDSCAPE_16x9,
imageSize: ImageConfigImageSize.SIZE_2K
}
};
// Make sure you initialize your chosen Gemini API backend service
const model = getGenerativeModel(ai, {
model: "gemini-nano-banana-2.1",
generationConfig
});
// ...
Dart
// ...
final generationConfig = GenerationConfig(
// Configure the model to respond with text (optional) and images (required).
// Include the text modality only if you want interleaved text and images in the response.
responseModalities: [ResponseModalities.text, ResponseModalities.image],
// Specify aspect ratio and image size (both optional) in an image config.
imageConfig: ImageConfig(
aspectRatio: ImageAspectRatio.landscape16x9,
imageSize: ImageSize.size2K,
),
);
// Make sure you initialize your chosen Gemini API backend service
final model = FirebaseAI.instance.generativeModel(
model: 'gemini-nano-banana-2.1,
generationConfig: generationConfig,
);
// ...
Unity
// ...
var generationConfig = new GenerationConfig(
// Configure the model to respond with text (optional) and images (required).
// Include the text modality only if you want interleaved text and images in the response.
responseModalities: new[] { ResponseModality.Text, ResponseModality.Image },
// Specify aspect ratio and image size (both optional) in an image config.
imageConfig: new ImageConfig(
aspectRatio: ImageConfig.AspectRatio.Landscape16x9,
imageSize: ImageConfig.ImageSize.Size2K)
);
// Make sure you initialize your chosen Gemini API backend service.
var model = FirebaseAI.GetInstance().GetGenerativeModel(
modelName: "gemini-nano-banana-2.1",
generationConfig: generationConfig
);
// ...
Formati supportati
Tutti i modelli Gemini Nano Banana supportano i seguenti formati:
Valore predefinito: 1:1 (quadrato)
1:1, 1:4, 1:8, 2:3, 3:2, 3:4, 4:1, 4:3, 4:5, 5:4, 8:1,
9:16, 16:9, 21:9
Dimensioni delle immagini supportate (risoluzioni)
Le dimensioni (risoluzioni) delle immagini supportate dipendono dal modello che utilizzi.
| Gemini Nano Banana modello | Dimensioni (risoluzioni) supportate |
|---|---|
Gemini Nano Banana 2.1gemini-nano-banana-2.1
|
Valore predefinito: 1K (1024)1K (1024), 2K (2048), 4K (4096)
|
Gemini Nano Banana 2gemini-3.1-flash-image
|
Valore predefinito: 1K (1024)512, 1K (1024), 2K (2048), 4K (4096)
|
Gemini Nano Banana 2 Litegemini-3.1-flash-lite-image
|
Valore predefinito: 1K (1024)512 (solo Gemini Developer API), 1K (1024)
|
Gemini Nano Banana Progemini-3-pro-image
|
Valore predefinito: 1K (1024)1K (1024), 2K (2048), 4K (4096)
|
Devi utilizzare un suffisso K in maiuscolo (ovvero 1K, 2K, 4K).
Il valore 512 non utilizza un suffisso K.
Un suffisso k in minuscolo (ad esempio 1k) verrà rifiutato.
Tieni presente che il modello gemini-2.5-flash-image è fisso a 1K (1024).
Funzionalità supportate
Di seguito sono riportate le funzionalità supportate, come modalità, strumenti, input e lingue.
Per le proporzioni e le risoluzioni supportate per ogni modello, consulta Configura la generazione di immagini in precedenza in questa guida.
Modalità supportate
Di seguito sono riportate le "modalità" supportate per i modelli Gemini Nano Banana. Queste "modalità" non vengono impostate esplicitamente nelle tue richieste. Sono più simili a pattern consigliati per casi d'uso comuni. Ogni modalità in questo elenco mostra un prompt di esempio e ha un esempio di codice riportato in precedenza in questa guida.
Testo Immagini (da solo testo a immagine)
- Genera un'immagine della Torre Eiffel con fuochi d'artificio sullo sfondo.
Testo Immagini (rendering del testo all'interno dell'immagine)
- Genera una foto cinematografica di un grande edificio con questo testo gigante proiettato sulla facciata dell'edificio.
Modifica delle immagini (da testo e immagine a immagine)
[immagine di scone] + Modifica questa immagine per farla sembrare un cartone animato
[immagine di un gatto] + [immagine di un cuscino] + Crea un punto croce del mio gatto su questo cuscino.
Video e testo Immagini (da testo e video a immagine)
- [video/URL di un parco] + Genera un'immagine poster che catturi i temi chiave di questo video.
Testo Immagini e testo (interleaved)
Genera una ricetta illustrata per una paella. Crea immagini insieme al testo mentre generi la ricetta.
Genera una storia su un cane in stile animazione di cartoni animati 3D. Per ogni scena, genera un'immagine.
Immagini e testo Immagini e testo (intervallati)
- [immagine di una stanza arredata] + Quali altri colori di divani starebbero bene nel mio spazio? Puoi aggiornare l'immagine?
Editing di immagini a più turni (chat)
- [immagine di un'auto blu] + Trasforma questa auto in una decappottabile., poi Ora cambia il colore in giallo.
Strumenti supportati
Supporto per il grounding con
Gemini Nano Banana 2.1 (
gemini-nano-banana-2.1)Gemini Nano Banana 2 (
gemini-3.1-flash-image)Gemini Nano Banana Pro (
gemini-3-pro-image)
Altre funzionalità supportate
Input multimodale supportato:
Input di immagini: tutti i modelli Nano Banana.
Ingresso video:
- Gemini Nano Banana 2.1 (
gemini-nano-banana-2.1) - Gemini Nano Banana 2 (
gemini-3.1-flash-image) - Gemini Nano Banana 2 Lite (
gemini-3.1-flash-lite-image)
- Gemini Nano Banana 2.1 (
Input audio: nessuno dei modelli Nano Banana.
Tutti i modelli Nano Banana supportano quanto segue:
- Generazione di immagini PNG.
- Generare e modificare immagini di persone.
- Utilizzare filtri di sicurezza che offrono un'esperienza utente flessibile e meno restrittiva.
Supporto per la generazione di output strutturati (come JSON):
- Gemini Nano Banana Pro (
gemini-3-pro-image)
- Gemini Nano Banana Pro (
Lingue supportate
Sebbene i modelli Gemini Nano Banana possano accettare prompt testuali in molte lingue, le lingue elencate in questa sezione offrono le prestazioni migliori.
Ecco le lingue supportate per il prompt testuale e il testo all'interno dell'immagine creata dall'AI:
ar-EG, de-DE, EN, es-MX, fr-FR, hi-IN, id-ID, it-IT,
ja-JP, ko-KR, pt-BR, ru-RU, uk-UA, vi-VN, zh-CN
Per utilizzare una lingua specifica all'interno di un'immagine creata dall'AI (anche senza il codice della lingua), basta chiedere al modello nel prompt (ad esempio, "Aggiorna questa infografica in spagnolo. Non modificare nessun altro elemento dell'immagine.").
Tieni presente che il modello gemini-2.5-flash-image supporta solo EN, es-MX, ja-JP, zh-CN, hi-IN nel prompt testuale e può generare solo inglese nelle immagini.
Best practice
Di seguito sono riportate le best practice per i modelli Gemini Nano Banana.
Quando generi un'immagine contenente testo, genera prima il testo e poi un'immagine con quel testo.
La generazione di immagini potrebbe non attivarsi sempre. Inoltre, la generazione di immagini o testo potrebbe non funzionare come previsto in queste situazioni:
Il modello potrebbe generare solo testo e nessuna immagine (soprattutto se il prompt è ambiguo). In questo caso,
FinishReasonèNO_IMAGE.
Prova a chiedere esplicitamente output di immagini. Ad esempio, "genera un'immagine", "fornisci immagini man mano che procedi", "aggiorna l'immagine".Il modello potrebbe interrompere la generazione a metà.
Riprova o prova con un altro prompt.Il modello potrebbe generare testo sotto forma di immagine.
Prova a chiedere esplicitamente output di testo. Ad esempio, "genera un testo narrativo con illustrazioni".Se un prompt è potenzialmente non sicuro, il modello potrebbe non elaborare la richiesta e restituire una risposta che indica che non può creare immagini non sicure. In questo caso,
FinishReasonèSTOP.