# Doubao Seedream 图像生成

> 图像生成

发起图片生成请求。请求体包含模型、提示词和可选生成参数，响应返回图片 URL 或 Base64 图像数据。

## 请求地址

`POST https://api.modelverse.cn/v1/images/generations`

## 请求体

## 响应

- **200** — Image generation response. Non-stream requests return JSON; stream requests return SSE.
- **400** — 请求参数无效或图像生成失败。
- **default** — 错误响应。

## OpenAPI 定义

```json
{
  "openapi": "3.1.0",
  "x-language": "zh-CN",
  "info": {
    "title": "doubao-seedream接口文档",
    "version": "1.0.0",
    "description": "这是 ModelVerse 上 `doubao-seedream` 的图片接口文档，说明如何发起图片生成或编辑请求、填写参数、读取结果以及处理错误。\n接口路径包括 `POST /v1/images/generations`。\n"
  },
  "servers": [
    {
      "url": "https://api.modelverse.cn",
      "description": "ModelVerse API endpoint documented for this model family."
    }
  ],
  "tags": [
    {
      "name": "doubao-seedream",
      "description": "Image generation and reference-image generation with doubao-seedream."
    }
  ],
  "security": [
    {
      "bearerAuth": []
    }
  ],
  "paths": {
    "/v1/images/generations": {
      "post": {
        "tags": [
          "doubao-seedream"
        ],
        "operationId": "createDoubaoSeedreamImageGeneration",
        "summary": "Doubao Seedream 图像生成",
        "description": "发起图片生成请求。请求体包含模型、提示词和可选生成参数，响应返回图片 URL 或 Base64 图像数据。\n",
        "requestBody": {
          "required": true,
          "content": {
            "application/json": {
              "schema": {
                "$ref": "#/components/schemas/DoubaoSeedreamGenerationRequest"
              },
              "examples": {
                "referenceImageToSketch": {
                  "summary": "根据 a 参考图 生成",
                  "value": {
                    "model": "doubao-seedream-4.5",
                    "prompt": "将图片转换为铅笔素描",
                    "images": [
                      "https://umodelverse-inference.cn-wlcb.ufileos.com/ucloud-maxcot.jpg"
                    ],
                    "size": "2k",
                    "watermark": false,
                    "stream": false,
                    "response_format": "url"
                  }
                },
                "webSearchWeatherPoster": {
                  "summary": "生成with web search使用doubao-seedream-5",
                  "value": {
                    "model": "doubao-seedream-5-0-260128",
                    "prompt": "制作一张上海未来5日的天气预报图，采用现代扁平化插画风格，清晰展示每日天气、温度和穿搭建议。",
                    "size": "2k",
                    "tools": [
                      {
                        "type": "web_search"
                      }
                    ],
                    "output_format": "jpeg",
                    "response_format": "url",
                    "watermark": false
                  }
                },
                "streamedBase64Group": {
                  "summary": "流式生成generated图像group as Base64 JSON",
                  "value": {
                    "model": "doubao-seedream-4.5",
                    "prompt": "生成一组现代城市公共空间导视图标",
                    "size": "2048x2048",
                    "sequential_image_generation": "auto",
                    "sequential_image_generation_options": {
                      "max_images": 3
                    },
                    "stream": true,
                    "response_format": "b64_json",
                    "watermark": true
                  }
                }
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "Image generation response. Non-stream requests return JSON; stream requests return SSE.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/DoubaoSeedreamGenerationResponse"
                },
                "examples": {
                  "urlImage": {
                    "summary": "返回 URL 的生成图像",
                    "value": {
                      "model": "doubao-seedream-4-5-251128",
                      "created": 1767939740,
                      "data": [
                        {
                          "url": "https://xxxxxx",
                          "size": "2048x2048"
                        }
                      ],
                      "usage": {
                        "generated_images": 1,
                        "output_tokens": 16384,
                        "total_tokens": 16384
                      }
                    }
                  },
                  "base64Image": {
                    "summary": "返回 Base64 JSON 的生成图像",
                    "value": {
                      "model": "doubao-seedream-4-5-251128",
                      "created": 1767939740,
                      "data": [
                        {
                          "b64_json": "{image_base64_string}",
                          "size": "2048x2048"
                        }
                      ],
                      "usage": {
                        "generated_images": 1,
                        "output_tokens": 16384,
                        "total_tokens": 16384
                      }
                    }
                  }
                }
              },
              "text/event-stream": {
                "schema": {
                  "$ref": "#/components/schemas/DoubaoSeedreamStreamEvent"
                },
                "examples": {
                  "streamedImage": {
                    "summary": "流式图像生成事件",
                    "value": "event: image_generation.partial_succeeded\ndata: {\"type\":\"image_generation.partial_succeeded\",\"model\":\"doubao-seedream-4-5-251128\",\"created\":1767939740,\"image_index\":0,\"url\":\"https://xxxxxx\",\"size\":\"2048x2048\"}\n\nevent: image_generation.completed\ndata: {\"type\":\"image_generation.completed\",\"model\":\"doubao-seedream-4-5-251128\",\"created\":1767939740,\"usage\":{\"generated_images\":1,\"output_tokens\":16384,\"total_tokens\":16384}}\n"
                  }
                }
              }
            }
          },
          "400": {
            "description": "请求参数无效或图像生成失败。",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/DoubaoSeedreamErrorResponse"
                },
                "examples": {
                  "requestError": {
                    "summary": "请求级错误",
                    "value": {
                      "error": {
                        "code": "error_code",
                        "message": "error_message"
                      }
                    }
                  }
                }
              }
            }
          },
          "default": {
            "description": "错误响应。",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/DoubaoSeedreamErrorResponse"
                },
                "examples": {
                  "requestError": {
                    "summary": "请求级错误",
                    "value": {
                      "error": {
                        "code": "error_code",
                        "message": "error_message"
                      }
                    }
                  }
                }
              }
            }
          }
        }
      }
    }
  },
  "components": {
    "securitySchemes": {
      "bearerAuth": {
        "type": "http",
        "scheme": "bearer",
        "bearerFormat": "API key",
        "description": "发起图片生成请求。请求体包含模型、提示词和可选生成参数，响应返回图片 URL 或 Base64 图像数据。\n"
      }
    },
    "schemas": {
      "DoubaoSeedreamGenerationRequest": {
        "type": "object",
        "additionalProperties": false,
        "required": [
          "model",
          "prompt"
        ],
        "properties": {
          "model": {
            "$ref": "#/components/schemas/DoubaoSeedreamModel"
          },
          "prompt": {
            "$ref": "#/components/schemas/DoubaoSeedreamPrompt"
          },
          "images": {
            "type": "array",
            "description": "参考图片输入。每个项目可以是可访问的 URL 或 Base64 数据 URL，例如 `data:image/png;base64,<base64_image>`。\n- `doubao-seedream-4.5` 和 `doubao-seedream-5-0-260128`: 最多支持 14 张参考图\n- Seedream 5.0 Pro (`doubao-seedream-5-0-pro-260628`): 最多支持 10 张参考图\n",
            "items": {
              "type": "string"
            }
          },
          "size": {
            "$ref": "#/components/schemas/DoubaoSeedreamSize"
          },
          "sequential_image_generation": {
            "$ref": "#/components/schemas/DoubaoSeedreamSequentialImageGeneration"
          },
          "sequential_image_generation_options": {
            "$ref": "#/components/schemas/DoubaoSeedreamSequentialImageGenerationOptions"
          },
          "stream": {
            "type": "boolean",
            "default": false,
            "description": "是否启用流式输出。`false` 在生成完成后返回所有图片结果；`true` 在每个图片结果可用时返回 SSE 事件。\n注意：Seedream 5.0 Pro (`doubao-seedream-5-0-pro-260628`) 不支持此参数。\n"
          },
          "response_format": {
            "type": "string",
            "enum": [
              "url",
              "b64_json"
            ],
            "default": "url",
            "description": "Image return format. URL links are valid for 24 hours after image\ngeneration; `b64_json` returns Base64-encoded image data.\n"
          },
          "watermark": {
            "type": "boolean",
            "default": true,
            "description": "Whether to add the documented \"AI generated\" watermark in the lower-right corner."
          },
          "optimize_prompt_options": {
            "type": "object",
            "additionalProperties": true,
            "description": "Prompt optimization options documented as an object."
          },
          "tools": {
            "type": "array",
            "description": "工具配置。仅 `doubao-seedream-5-0-260128` 支持此参数。\n注意：Seedream 5.0 Pro (`doubao-seedream-5-0-pro-260628`) 不支持此参数。\n",
            "items": {
              "$ref": "#/components/schemas/DoubaoSeedreamTool"
            }
          },
          "output_format": {
            "type": "string",
            "enum": [
              "png",
              "jpeg"
            ],
            "default": "jpeg",
            "description": "Output image file format. The source document states this parameter is supported only by `doubao-seedream-5-0-260128`."
          }
        }
      },
      "DoubaoSeedreamModel": {
        "type": "string",
        "enum": [
          "doubao-seedream-4.5",
          "doubao-seedream-5-0-260128",
          "doubao-seedream-5-0-pro-260628"
        ],
        "description": "模型名称。\n- `doubao-seedream-4.5`: 支持组图生成、流式输出\n- `doubao-seedream-5-0-260128`: 支持组图生成、联网搜索、流式输出\n- `doubao-seedream-5-0-pro-260628`: 仅支持单图生成，不支持组图生成、联网搜索、流式输出\n"
      },
      "DoubaoSeedreamPrompt": {
        "type": "string",
        "minLength": 1,
        "description": "发起图片生成请求。请求体包含模型、提示词和可选生成参数，响应返回图片 URL 或 Base64 图像数据。\n"
      },
      "DoubaoSeedreamSize": {
        "type": "string",
        "description": "图片尺寸。支持 `2K`、`4K` 或 `<宽>x<高>` 形式的显式像素值。\n显式像素值默认 `2048x2048`，总像素范围为 3686400 到 16777216，\n宽高比范围为 1/16 到 16。\n",
        "default": "2048x2048",
        "x-min-pixels": 3686400,
        "x-max-pixels": 16777216,
        "x-min-aspect-ratio": "1:16",
        "x-max-aspect-ratio": "16:1",
        "oneOf": [
          {
            "pattern": "^[24][Kk]$"
          },
          {
            "pattern": "^[1-9][0-9]*x[1-9][0-9]*$"
          }
        ],
        "examples": [
          "2K",
          "4K",
          "2048x2048",
          "2304x1728",
          "1728x2304",
          "2560x1440",
          "1440x2560",
          "2496x1664",
          "1664x2496",
          "3024x1296"
        ]
      },
      "DoubaoSeedreamSequentialImageGeneration": {
        "type": "string",
        "enum": [
          "auto",
          "disabled"
        ],
        "default": "disabled",
        "description": "组图生成模式。`auto` 让模型决定是否返回组图以及包含多少张图片；`disabled` 生成单张图片。\n注意：Seedream 5.0 Pro (`doubao-seedream-5-0-pro-260628`) 不支持此参数，只能生成单张图片。\n"
      },
      "DoubaoSeedreamSequentialImageGenerationOptions": {
        "type": "object",
        "additionalProperties": false,
        "description": "组图生成选项。仅在 `sequential_image_generation` 为 `auto` 时使用。\n注意：Seedream 5.0 Pro (`doubao-seedream-5-0-pro-260628`) 不支持此参数。\n",
        "properties": {
          "max_images": {
            "type": "integer",
            "minimum": 1,
            "maximum": 15,
            "description": "本次请求最多生成的图片数量。"
          }
        }
      },
      "DoubaoSeedreamTool": {
        "type": "object",
        "additionalProperties": false,
        "properties": {
          "type": {
            "type": "string",
            "const": "web_search",
            "default": "web_search",
            "description": "Web search tool. When enabled, the model decides whether to search\nthe internet based on the prompt.\n"
          }
        }
      },
      "DoubaoSeedreamGenerationResponse": {
        "type": "object",
        "additionalProperties": false,
        "required": [
          "model",
          "created",
          "data"
        ],
        "properties": {
          "model": {
            "type": "string",
            "description": "此请求使用的模型 ID。"
          },
          "created": {
            "type": "integer",
            "format": "int64",
            "description": "Unix timestamp in seconds for when the request was created."
          },
          "data": {
            "type": "array",
            "description": "Output image entries. Entries can contain image data or per-image error information.",
            "items": {
              "$ref": "#/components/schemas/DoubaoSeedreamImageData"
            }
          },
          "usage": {
            "$ref": "#/components/schemas/DoubaoSeedreamUsage"
          },
          "error": {
            "$ref": "#/components/schemas/DoubaoSeedreamError"
          }
        }
      },
      "DoubaoSeedreamImageData": {
        "type": "object",
        "additionalProperties": false,
        "properties": {
          "url": {
            "type": "string",
            "format": "uri",
            "description": "Image download URL returned when `response_format` is `url`; valid for 24 hours after generation."
          },
          "b64_json": {
            "type": "string",
            "contentEncoding": "base64",
            "description": "Base64 image data returned when `response_format` is `b64_json`."
          },
          "size": {
            "type": "string",
            "pattern": "^[1-9][0-9]*x[1-9][0-9]*$",
            "description": "Image dimensions in `<width>x<height>` pixels."
          },
          "error": {
            "$ref": "#/components/schemas/DoubaoSeedreamError"
          }
        }
      },
      "DoubaoSeedreamUsage": {
        "type": "object",
        "additionalProperties": false,
        "properties": {
          "generated_images": {
            "type": "integer",
            "description": "Successfully generated image count, excluding failed images."
          },
          "output_tokens": {
            "type": "integer",
            "description": "Tokens spent on generated images. The source describes this as the\nrounded value of `sum(image_width * image_height) / 256`.\n"
          },
          "total_tokens": {
            "type": "integer",
            "description": "Total tokens consumed by the request; currently equal to `output_tokens`."
          }
        }
      },
      "DoubaoSeedreamErrorResponse": {
        "type": "object",
        "additionalProperties": false,
        "required": [
          "error"
        ],
        "properties": {
          "error": {
            "$ref": "#/components/schemas/DoubaoSeedreamError"
          }
        }
      },
      "DoubaoSeedreamError": {
        "type": "object",
        "additionalProperties": false,
        "required": [
          "code",
          "message"
        ],
        "properties": {
          "code": {
            "type": "string",
            "description": "错误码。"
          },
          "message": {
            "type": "string",
            "description": "错误信息。"
          }
        }
      },
      "DoubaoSeedreamStreamEvent": {
        "description": "发起图片生成请求。请求体包含模型、提示词和可选生成参数，响应返回图片 URL 或 Base64 图像数据。\n",
        "oneOf": [
          {
            "$ref": "#/components/schemas/DoubaoSeedreamPartialSucceededEvent"
          },
          {
            "$ref": "#/components/schemas/DoubaoSeedreamPartialFailedEvent"
          },
          {
            "$ref": "#/components/schemas/DoubaoSeedreamCompletedEvent"
          }
        ],
        "discriminator": {
          "propertyName": "type"
        }
      },
      "DoubaoSeedreamPartialSucceededEvent": {
        "type": "object",
        "additionalProperties": false,
        "required": [
          "type",
          "model",
          "created",
          "image_index"
        ],
        "properties": {
          "type": {
            "type": "string",
            "const": "image_generation.partial_succeeded"
          },
          "model": {
            "type": "string",
            "description": "此请求使用的模型 ID。"
          },
          "created": {
            "type": "integer",
            "format": "int64",
            "description": "Unix timestamp in seconds for when the request was created."
          },
          "image_index": {
            "type": "integer",
            "minimum": 0,
            "description": "Zero-based image index for this request."
          },
          "url": {
            "type": "string",
            "format": "uri",
            "description": "Image download URL returned when `response_format` is `url`."
          },
          "b64_json": {
            "type": "string",
            "contentEncoding": "base64",
            "description": "Base64 image data returned when `response_format` is `b64_json`."
          },
          "size": {
            "type": "string",
            "pattern": "^[1-9][0-9]*x[1-9][0-9]*$",
            "description": "Image dimensions in `<width>x<height>` pixels."
          }
        }
      },
      "DoubaoSeedreamPartialFailedEvent": {
        "type": "object",
        "additionalProperties": false,
        "required": [
          "type",
          "model",
          "created",
          "image_index",
          "error"
        ],
        "properties": {
          "type": {
            "type": "string",
            "const": "image_generation.partial_failed"
          },
          "model": {
            "type": "string",
            "description": "此请求使用的模型 ID。"
          },
          "created": {
            "type": "integer",
            "format": "int64",
            "description": "Unix timestamp in seconds for when the request was created."
          },
          "image_index": {
            "type": "integer",
            "minimum": 0,
            "description": "Zero-based image index for this request."
          },
          "error": {
            "$ref": "#/components/schemas/DoubaoSeedreamError"
          }
        }
      },
      "DoubaoSeedreamCompletedEvent": {
        "type": "object",
        "additionalProperties": false,
        "required": [
          "type",
          "model",
          "created",
          "usage"
        ],
        "properties": {
          "type": {
            "type": "string",
            "const": "image_generation.completed"
          },
          "model": {
            "type": "string",
            "description": "此请求使用的模型 ID。"
          },
          "created": {
            "type": "integer",
            "format": "int64",
            "description": "Unix timestamp in seconds for when the request was created."
          },
          "usage": {
            "$ref": "#/components/schemas/DoubaoSeedreamUsage"
          }
        }
      }
    }
  }
}
```