A source image to be used in the generation process.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v26/services/asset_generation_service.proto)

| Fields ||
|---|---|
| ## `image` Union field. The image to be used as a source. `image` can be only one of the following: ||
| ### `image_data` | `bytes` Optional. Raw bytes of the image to use. |