Generate Image - Learn WorkflowDog

The Google Gemini Generate Image action returns one generated image file. It supports a broad set of aspect ratios and model-dependent output resolution.

Inputs

Input	Type	Required	Description
Third-party account	Google Generative AI account	Yes	The API key used for generation.
Prompt	String	Yes	A description of the image to create.
Model	Enum	Yes	Gemini 2.5 Flash Image or Gemini 3 Pro Image. Defaults to Gemini 2.5 Flash Image.
Aspect Ratio	Enum	Yes	`1:1`, `2:3`, `3:2`, `3:4`, `4:3`, `4:5`, `5:4`, `9:16`, `16:9`, or `21:9`.
Image Size	Enum	Sometimes	`1K`, `2K`, or `4K`; shown only for Gemini 3 Pro Image. Defaults to `2K`.

Output

Output	Type	Description
Image	File	The generated image with the MIME type returned by Gemini.

WorkflowDog makes up to three generation attempts when Gemini returns no image data. The action fails if all attempts produce no image.

Pick the aspect ratio for the destination first—such as 9:16 for a story or 16:9 for a banner—then describe composition with that frame in mind.