IMPORTANT: In July 2025, we stopped releasing new versions of KTX modules, and we removed the KTX libraries from the Firebase Android BoM (v34.0.0). If you use KTX APIs from the previously released KTX modules, we recommend that you migrate your app to use KTX APIs from the main modules instead. For details, see the FAQ about this initiative.

ImagenSubjectReference

@PublicPreviewAPI
class ImagenSubjectReference : ImagenReferenceImage

kotlin.Any
↳	com.google.firebase.ai.type.ImagenReferenceImage
	↳	com.google.firebase.ai.type.ImagenSubjectReference

A reference image for generating an image with a specific subject

Deprecation Notice: All Imagen models are deprecated and will shut down as early as June 2026. As a replacement, you can migrate your apps to use Gemini Image models (the 'Nano Banana' models)

Summary

Public constructors
`ImagenSubjectReference( image: ImagenInlineImage, referenceId: Int?, description: String?, subjectType: ImagenSubjectReferenceType? )`

Inherited properties

From com.google.firebase.ai.type.ImagenReferenceImage

`ImagenInlineImage?`	`image`
`Int?`	`referenceId`

Public constructors

ImagenSubjectReference

ImagenSubjectReference(
    image: ImagenInlineImage,
    referenceId: Int? = null,
    description: String? = null,
    subjectType: ImagenSubjectReferenceType? = null
)

Parameters
`image: ImagenInlineImage`	the image of the subject
`referenceId: Int? = null`	the reference ID you can use to reference this subject in your prompt
`description: String? = null`	the description you can use to reference this subject in your prompt
`subjectType: ImagenSubjectReferenceType? = null`	the type of the subject