This skill provides methods for calling the Volcengine Ark large model service platform's image generation models (Seedream).

Select Environment

The script provides implementations for both Python and JavaScript:

• If your runtime is primarily Node.js/TypeScript or a web module, use scripts/seedream.js.
• If your runtime involves complex data analysis, batch scheduling, or is purely Python, use scripts/seedream.py.

Supported Model Parameters (Model ID/Endpoint ID)

When invoking, the model parameter needs to be the deployment Endpoint ID from the Ark console (e.g., ep-202X...), which must be backed by one of the following foundational image generation models:

• doubao-seedream-5-0-260128
• doubao-seedream-4-5-251128
• doubao-seedream-4-0-250828

Script Parameters

You must pass specific parameters to control the image generation. The available parameters are:

• model (string, optional): Endpoint ID corresponding to the model. Defaults to doubao-seedream-5-0-260128.
• prompt (string, required): Text description used to generate the image.
• size (string, optional): Target image size. Supports "2K", "3K", "4K".

- doubao-seedream-5-0 supports 2K and 3K. - doubao-seedream-4 and doubao-seedream-4-5 support 2K and 4K. - If not provided, this parameter is completely ignored in the API request. - You can also specify the desired resolution directly in the prompt. It is highly recommended to explicitly state the resolution in the prompt for the best results.

• image (string | list of strings, optional): Local image path or image path list used for image-to-image generation. The scripts will read the local file, convert it to base64, and send it as the request image field.
• watermark (boolean, optional): Whether to add a Volcengine AI watermark. Unprovided value assumes false.
• optimize_prompt_options (object, optional): Configure automatic prompt optimization options. Format: JSON object. E.g., {"mode": "standard"}.
• tools (list of objects, optional): Capabilities options for the model, formatted as JSON. Example: [{"type": "web_search"}].
• output_format (string, optional): The output image format. Options include png, jpeg.
• sequential_image_generation (string, optional): Sequential image generation strategy (e.g., "auto").
• download_dir (string, optional): Local directory to save the generated images. If not provided, images will not be downloaded locally, and only the API response will be returned.

Recommended width and height values

Resolution	Aspect Ratio	Dimensions
2K	1:1	2048x2048
4:3	2304x1728
3:4	1728x2304
16:9	2848x1600
9:16	1600x2848
3:2	2496x1664
2:3	1664x2496
21:9	3136x1344
3K	1:1	3072x3072
4:3	3456x2592
3:4	2592x3456
16:9	4096x2304
9:16	2304x4096
2:3	2496x3744
3:2	3744x2496
21:9	4704x2016
4K	1:1	4096x4096
3:4	3520x4704
4:3	4704x3520
16:9	5504x3040
9:16	3040x5504
2:3	3328x4992
3:2	4992x3328
21:9	6240x2656

Usage Examples

Python Example:

python3 /scripts/seedream.py \
  --prompt "A cute orange cat laying under the sun" \
  --model "ep-xxxxx..." \
  --size "1024x1024" \
  --watermark "false" \
  --output_format "png"

Node.js Example:

node /scripts/seedream.js \
  --prompt "A cute orange cat laying under the sun" \
  --model "ep-xxxxx..." \
  --size "1024x1024" \
  --watermark "false" \
  --output_format "png"

python3 /scripts/seedream.py \ --prompt "Turn this product photo into a clean white-background ecommerce image" \ --image "/path/to/source.png" \ --model "ep-xxxxx..."

Example with Download Directory:

python3 /scripts/seedream.py \
  --prompt "A beautiful sunset over the mountains" \
  --download_dir "/Users/vincent/Downloads/generated_images" \
  --model "ep-xxxxx..."

python3 /scripts/seedream.py \ --prompt "A futuristic cityscape" \ --model "ep-xxxxx..." \ --optimize_prompt_options '{"mode": "standard"}' \ --tools '[{"type": "web_search"}]'

Troubleshooting

If the scripts encounter issues, please check the following:

• SEEDREAM_API_KEY: (env, required) Ensure this API key is set in your environment. It is the core authentication for Volcengine Ark.
• SEEDREAM_BASE_URL: (env, optional) Ensure this is correct if you are using a custom endpoint. Defaults to https://ark.cn-beijing.volces.com/api/v3/images/generations.

For more detailed API documentation, please visit: https://www.volcengine.com/docs/82379/1541523?lang=zh For more model id list or check the newest model id if required, please visit: https://www.volcengine.com/docs/82379/1330310?lang=zh#36969059, and then update this seedream-image-generation/SKILL.md file "Supported Model Parameters".

python3 /scripts/seedream.py \
  --prompt "A cute orange cat laying under the sun" \
  --model "ep-xxxxx..." \
  --size "1024x1024" \
  --watermark "false" \
  --output_format "png"

node /scripts/seedream.js \
  --prompt "A cute orange cat laying under the sun" \
  --model "ep-xxxxx..." \
  --size "1024x1024" \
  --watermark "false" \
  --output_format "png"

python3 /scripts/seedream.py \
  --prompt "A beautiful sunset over the mountains" \
  --download_dir "/Users/vincent/Downloads/generated_images" \
  --model "ep-xxxxx..."