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Seedream 4.0 i2i is an image-to-image generation model from ByteDance’s Seedream series, available through AnyFast API.

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Key capabilities

  • Image-to-Image — Generate images with reference images and text prompts
  • Sequential Generation — Batch generate multiple images in one request
  • Custom Size — Flexible output sizes
  • Watermark Control — Optional watermark and logo configuration

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Quick example

curl https://www.anyfast.ai/v1/images/generations \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "doubao-seedream-4-0-250828",
    "prompt": "A girl and a cow doll happily riding a roller coaster, morning, noon, and night",
    "image": ["https://example.com/ref1.png", "https://example.com/ref2.png"],
    "sequential_image_generation": "auto",
    "sequential_image_generation_options": {
      "max_images": 3
    },
    "size": "2K",
    "watermark": false
  }'

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Parameters

ParameterTypeRequiredDescription
modelstringYesMust be doubao-seedream-4-0-250828
promptstringYesText prompt for image generation
imagearrayYesArray of reference image URLs
sequential_image_generationstringNoSet to auto to enable batch generation
sequential_image_generation_optionsobjectNoOptions: max_images (int)
sizestringNoOutput image size, e.g. 1024x1024, 2K
watermarkbooleanNoDefault: false
seedintegerNoRandom seed for reproducibility
logo_infoobjectNoLogo config: add_logo, position, language, opacity

API Reference

View the interactive API playground for Seedream 4.0 i2i.