Poor Image Quality in Gemini Batch API Compared to Single Generation

### **Description**

I'm using the Gemini Batch API for image generation, and I've noticed that the generated image quality is significantly lower compared to non-batch (single request) image generation.

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### **Steps to Reproduce**

1. Call the Gemini Batch API for image generation with a standard prompt
2. Generate images using the same prompt via single (non-batch) API
3. Compare the output quality

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### **Expected Behavior**

The image quality from the Batch API should be consistent with the quality produced by the standard (non-batch) image generation API.

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### **Actual Behavior**

* Images generated via Batch API appear:

* Lower resolution
* Less detailed
* Slightly distorted in some cases

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