Wan 2.7 Image Generation & Editing

Validation

mkdir -p output/aliyun-wan-image
python -m py_compile skills/ai/image/aliyun-wan-image/scripts/generate_image.py && echo "py_compile_ok" > output/aliyun-wan-image/validate.txt

Pass criteria: command exits 0 and output/aliyun-wan-image/validate.txt is generated.

Output And Evidence

• Write generated image URLs, prompts, and metadata to output/aliyun-wan-image/.
• Keep at least one sample JSON response per run.

Prerequisites

• Install SDK (recommended in a venv):

python3 -m venv .venv
. .venv/bin/activate
python -m pip install dashscope

• Set DASHSCOPE_API_KEY in your environment, or add dashscope_api_key to ~/.alibabacloud/credentials.

Critical model names

• wan2.7-image-pro — professional version, supports 4K output
• wan2.7-image — faster generation, up to 2K

Capabilities

Capability	Description
Text-to-image	Generate images from text prompts
Image editing	Edit images with text instructions (1-9 input images)
Interactive editing	Edit specific regions via bounding boxes (bbox_list)
Group generation	Generate consistent multi-image sequences (enable_sequential=true, up to 12 images)
Color palette	Control color theme with custom hex+ratio palette (3-10 colors)
Thinking mode	Enhanced reasoning for better quality (text-to-image only)

API endpoint

Sync (recommended):

POST https://dashscope.aliyuncs.com/api/v1/services/aigc/multimodal-generation/generation

Async (for long tasks):

POST https://dashscope.aliyuncs.com/api/v1/services/aigc/image-generation/generation
Header: X-DashScope-Async: enable

Normalized interface (image.generate)

Request

• prompt (string, required) — up to 5000 characters
• size (string, optional) — 1K, 2K (default), 4K (pro only), or WxH pixel values
• n (int, optional) — number of images, 1-4 (default 4), or 1-12 with enable_sequential
• seed (int, optional) — range [0, 2147483647]
• reference_image (string/array, optional) — URL or base64, up to 9 images
• enable_sequential (bool, optional) — group image generation mode
• thinking_mode (bool, optional, default true) — enhanced reasoning (text-to-image only)
• bbox_list (array, optional) — bounding boxes for interactive editing
• color_palette (array, optional) — custom color theme (3-10 colors with hex+ratio)
• watermark (bool, optional, default false)

Response

• image_url (string) — PNG, valid for 24 hours
• image_count (int)
• size (string) — actual output resolution
• seed (int)

Quick start (Python + DashScope SDK)

import os
from dashscope.aigc.image_generation import ImageGeneration

def generate_image(req: dict) -> dict:
    messages = [
        {
            "role": "user",
            "content": [{"text": req["prompt"]}],
        }
    ]

    # Add reference images if provided
    ref_images = req.get("reference_images") or []
    if req.get("reference_image"):
        ref_images = [req["reference_image"]] + ref_images
    for img in ref_images:
        messages[0]["content"].append({"image": img})

    params = {
        "model": req.get("model", "wan2.7-image"),
        "messages": messages,
        "size": req.get("size", "2K"),
        "n": req.get("n", 1),
        "api_key": os.getenv("DASHSCOPE_API_KEY"),
        "seed": req.get("seed"),
        "watermark": req.get("watermark", False),
    }

    if req.get("enable_sequential"):
        params["enable_sequential"] = True
    if req.get("thinking_mode") is not None:
        params["thinking_mode"] = req["thinking_mode"]
    if req.get("bbox_list"):
        params["bbox_list"] = req["bbox_list"]
    if req.get("color_palette"):
        params["color_palette"] = req["color_palette"]

    response = ImageGeneration.call(**params)

    content = response.output["choices"][0]["message"]["content"]
    images = [item["image"] for item in content if isinstance(item, dict) and item.get("image")]

    return {
        "image_urls": images,
        "image_count": response.usage.get("image_count"),
        "size": response.usage.get("size"),
    }

Size reference

Model	Supported sizes	Default
wan2.7-image-pro	1K, 2K, 4K (text-to-image only), or [768, 4096] px	2K
wan2.7-image	1K, 2K, or [768, 2048] px	2K

Error handling

Error	Likely cause	Action
401/403	Missing or invalid DASHSCOPE_API_KEY	Check env var or credentials file.
400 InvalidParameter	Unsupported size, bad n value, or missing required image	Validate parameters against model limits.
429	Rate limit or quota	Retry with backoff.

Output location

• Default output: output/aliyun-wan-image/images/
• Override base dir with OUTPUT_DIR.

Anti-patterns

• Do not invent model names; use wan2.7-image or wan2.7-image-pro only.
• Do not use 4K size with wan2.7-image (only pro supports 4K).
• Do not use enable_sequential with bbox_list — they are separate modes.
• Image URLs expire after 24 hours; download and persist immediately.

Workflow

1. Confirm user intent: text-to-image, image editing, group generation, or interactive editing.
2. Select appropriate model (pro for 4K or higher quality, standard for speed).
3. Execute with explicit parameters and bounded scope.
4. Download and save generated images before URL expiration.

References

• See references/api_reference.md for full HTTP API details.
• See references/sources.md for source links.