Qwen - Image to Image

Endpoint

POST /images/generations

Full URL: https://modelfold.ai/v1/images/generations

Authentication: every request must include the Authorization: Bearer <API_KEY> header.

Send model parameters directly in the JSON body. Do not wrap them in input. This request waits for generation to finish and returns data[].url; supported media models also offer async jobs, polling and callbacks. Replace example media URLs with your own publicly accessible files. See API gateway for billing and errors.

Input parameters for the generation task

Request Parameters

Body (application/json)

Parameter	Type	Required	Description
model	string	Yes	The model name to use for generation. Required field. - Must be qwen/image-to-image for this endpoint Default："qwen/image-to-image"。 Allowed values：qwen/image-to-image。 Example：qwen/image-to-image。
prompt	string	Yes	Prompt required by the ModelFold gateway; at most 2000 characters. The prompt to generate the image with (Max length: 5000 characters) maxLength: 2000. Example：Change the season from winter to spring. Keep the same composition, with the cabin, lake, and mountains unchanged. Fill the scene with warmth and vitality using blooming flowers and lush greenery.。
image_url	string	Yes	The reference image to guide the generation (File URL after upload, not file content; Accepted types: image/jpeg, image/png, image/webp; Max size: 10.0MB) Example：https://static.aiquickdraw.com/tools/example/1786021267002_2vLU3iDm.png。
strength	number	No	Denoising strength. 1.0 = fully remake; 0.0 = preserve original (Min: 0, Max: 1, Step: 0.01) (step: 0.01) Default：0.8。 minimum: 0. maximum: 1. Example：0.8。
output_format	string	No	The format of the generated image Default："png"。 Allowed values：png / jpeg。 Example：png。
acceleration	string	No	Acceleration level for image generation. Options: 'none', 'regular', 'high'. Higher acceleration increases speed. 'regular' balances speed and quality. 'high' is recommended for images without text Default："none"。 Allowed values：none / regular / high。 Example：none。
negative_prompt	string	No	The negative prompt for the generation (Max length: 500 characters) maxLength: 500. Example：blurry, ugly。
seed	integer	No	The same seed and the same prompt given to the same version of the model will output the same image every time
num_inference_steps	number	No	The number of inference steps to perform (Min: 2, Max: 250, Step: 1) (step: 1) Default：30。 minimum: 2. maximum: 250. Example：30。
guidance_scale	number	No	The CFG (Classifier Free Guidance) scale is a measure of how close you want the model to stick to your prompt when looking for a related image to show you (Min: 0, Max: 20, Step: 0.1) (step: 0.1) Default：2.5。 minimum: 0. maximum: 20. Example：2.5。
enable_safety_checker	boolean	No	The safety checker is always enabled in Playground. It can only be disabled by setting false through the API. (Boolean value (true/false)) Example：true。
nsfw_checker	boolean	No	Defaults to false. When false, no additional content filtering is applied and results are returned directly by the model.

Request Example

curl -X POST "https://modelfold.ai/v1/images/generations" \
  -H "Authorization: Bearer $MODELFOLD_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "qwen/image-to-image",
  "prompt": "Change the season from winter to spring. Keep the same composition, with the cabin, lake, and mountains unchanged. Fill the scene with warmth and vitality using blooming flowers and lush greenery.",
  "image_url": "https://static.aiquickdraw.com/tools/example/1786021267002_2vLU3iDm.png",
  "strength": 0.8,
  "output_format": "png",
  "acceleration": "none",
  "num_inference_steps": 30,
  "guidance_scale": 2.5
}'

{
  "model": "qwen/image-to-image",
  "prompt": "Change the season from winter to spring. Keep the same composition, with the cabin, lake, and mountains unchanged. Fill the scene with warmth and vitality using blooming flowers and lush greenery.",
  "image_url": "https://static.aiquickdraw.com/tools/example/1786021267002_2vLU3iDm.png",
  "strength": 0.8,
  "output_format": "png",
  "acceleration": "none",
  "num_inference_steps": 30,
  "guidance_scale": 2.5
}

Response

200 — Generation completed. usage contains actual billing details; result URLs are illustrative.

{
  "ok": true,
  "created": 1792134000,
  "data": [
    {
      "url": "https://modelfold.ai/uploads/outputs/result.png"
    }
  ],
  "usage": {}
}