Skip to main content

​
Short answer

An overall reddish/warm cast on Nano Banana Pro (gemini-3-pro-image) image edits is a frequently seen symptom. Two common mitigations:
  1. Route banana pro through the Vertex channel
  2. Switch to gpt-image-2 for the edit task

​
Detailed explanation

​
Which channel does banana pro use by default?

Nano Banana Pro on apiyi routes through the official AI Studio channel by default. Vertex is a separate, optional pool that takes over when AI Studio has issues (see Is Google routed through AI Studio or Vertex?).

​
How do I switch to Vertex?

Vertex is exposed as a separate group in the apiyi console. When creating or editing a token, pick a Vertex-related group; no code change is required (see Is Google routed through AI Studio or Vertex?).

​
Will gpt-image-2 fix this?

gpt-image-2 generally preserves source colors better on edit tasks. Treat it as a fallback option — see GPT-Image-2 image edit API.

​
Troubleshooting

1

Reproduce on the web playground

Open imagen.apiyi.com and re-run the same prompt + reference image.
2

Confirm the reference image is uploaded as base64

Nano Banana Pro does not accept OpenAI-style reference image uploads — base64 is required (see Image output differs heavily from the reference image). If you put a URL directly into image_url, the model is essentially “imagining” the reference, which can also manifest as a color cast.
3

Try the Vertex channel

Switch your token’”’“‘s group to a Vertex group and re-run the same prompt. Compare the cast against AI Studio.
4

Try gpt-image-2

If Vertex still shows a cast, fall back to gpt-image-2. Note that the visual style will differ from banana pro; expect to re-tune your prompt.

​
FAQ

banana pro leans toward “stylized re-render”, gpt-image-2 leans toward “subtle in-place edit”. gpt-image-2 typically preserves source colors better.

​
Contact us

If you need help confirming whether the Vertex group is available on your account, or troubleshooting edit color casts, please reach out to support.