Seedream 圖像生成
使用 CometAPI POST /v1/images/generations 進行 Seedream 文字轉圖像與圖像轉圖像生成 —— 支援依序多圖輸出與參考圖像。
{
"created": 123,
"data": [
{
"url": "<string>",
"b64_json": "<string>",
"size": "<string>"
}
],
"usage": {
"generated_images": 123,
"output_tokens": 123,
"total_tokens": 123
},
"model": "<string>"
}概覽
透過標準 OpenAI 相容的/v1/images/generations 端點，使用 ByteDance 的 Seedream 模型生成圖像。支援 文字轉圖像 與 圖像轉圖像 生成。
完整模型清單請參閱模型頁面。如需供應商提供的詳細參數文件，請參閱 VolcEngine 文件。
sequential_image_generation 設為 auto，並可選擇設定 sequential_image_generation_options.max_images 來限制輸出圖像數量。參考圖像與生成圖像的總數必須 ≤ 15。圖像轉圖像
透過image 參數（URL 或 base64 data URI 陣列）傳入一張或多張參考圖像，並搭配文字提示。最多支援 14 張參考圖像。
回傳的 URL 出現 AccessDenied？
url 是已簽名的物件儲存連結，包含 & 與其他特殊字元。如果你複製原始 JSON 並直接貼到瀏覽器或腳本中，shell 轉義或終端截斷可能會移除簽名參數，導致出現：
\{"Code":"AccessDenied","Message":"Access Denied","EC":"0003-00000015"\}
- curl：透過
| jq -r '.data[].url'管線擷取 URL，避免內容被破壞。 - Python：使用
result.data[0].url或image["url"]—— 該字串已完整，可直接傳給requests.get()或webbrowser.open()。 - JavaScript：同樣的做法 ——
result.data[0].url。 - 一般情況：請確認 URL 中的
&與%沒有被截斷或重複轉義。
授權
Bearer token authentication. Use your CometAPI key.
主體
Parameters for Seedream image generation (text-to-image and image-to-image).
Model to use. See the Models page for current Seedream model IDs.
Text prompt describing the image to generate. Supports both Chinese and English. Recommended max 300 Chinese characters or 1000 English characters.
Output format. url returns a temporary image link (valid for 24 hours); b64_json returns base64-encoded image data.
url, b64_json Output resolution. Presets 2K, 4K, or exact pixels like 2048x2048, 2304x1728, 2848x1600, 1600x2848, etc. Default: 2048x2048.
Reference image(s) for image-to-image generation. Each item is a public URL or base64 data URI (data:image/png;base64,...). Supports up to 14 reference images. Supported formats: jpeg, png, webp, bmp, tiff, gif.
When true, adds an 'AI Generated' watermark to the bottom-right corner of the output image.
Controls how closely the output follows the prompt. Higher values increase adherence but may reduce naturalness. Range: 1.0–10.0. Not supported by Seedream 5.0 (ignored).
Random seed for reproducible outputs. Range: -1 to 2147483647. Use -1 (default) for random generation. Legacy parameter — ignored by newer models.
Controls sequential (multi-image) generation mode.
auto: model decides whether to generate a sequence based on the promptdisabled: always generate a single image
auto, disabled Configuration for sequential (multi-image) generation. Only effective when sequential_image_generation is auto.
Show child attributes
Show child attributes
Output image file format. Options: png, jpeg.
png, jpeg 回應
Successful Response
{
"created": 123,
"data": [
{
"url": "<string>",
"b64_json": "<string>",
"size": "<string>"
}
],
"usage": {
"generated_images": 123,
"output_tokens": 123,
"total_tokens": 123
},
"model": "<string>"
}