Gemini 3 Pro Image 参数

{
  "contents": [{
    "role": "user",
    "parts": [{"text": "高端腕表广告图，金属反射准确，留出品牌文案区域"}]
  }],
  "generationConfig": {
    "responseModalities": ["TEXT", "IMAGE"],
    "imageConfig": {"aspectRatio": "1:1", "imageSize": "4K"}
  }
}

{
  "contents": [{
    "role": "user",
    "parts": [
      {"text": "保留腕表和表带，把背景换成深灰石材"},
      {"inlineData": {"mimeType": "image/jpeg", "data": "BASE64_SOURCE_IMAGE_1"}},
      {"inlineData": {"mimeType": "image/png", "data": "BASE64_SOURCE_IMAGE_2"}}
    ]
  }],
  "generationConfig": {
    "responseModalities": ["IMAGE"],
    "imageConfig": {"aspectRatio": "1:1", "imageSize": "2K"}
  }
}