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POST
/
api
/
v1
/
client
/
job
/
CreateTask
Image upscale and enhancement
curl --request POST \
  --url https://api.crun.ai/api/v1/client/job/CreateTask \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "model": "image-upscale",
  "callback_url": "https://your-domain.com/api/callback",
  "input": {
    "img_urls": [
      "https://example.com/input.jpg"
    ],
    "prompt": "masterpiece, best quality, ultra detailed, realistic",
    "negative_prompt": "worst quality, low quality, blurry, artifacts",
    "scale_factor": 2,
    "dynamic": 6,
    "creativity": 0.3,
    "resemblance": 0.8,
    "num_inference_steps": 18,
    "handfix": "disabled",
    "output_format": "png"
  }
}
'
{
  "code": 200,
  "message": "success",
  "data": {
    "task_id": "task_12345678"
  }
}

​
Overview

image-upscale is an AI enhancement endpoint for enlarging images while improving detail quality.
It supports prompt-guided enhancement, hand correction, optional mask control, and output format selection.

​
Before & After Example

Before (input): Before After (upscaled output): After

​
Parameter Notes

  • scale_factor: Output scale multiplier. Larger values produce larger images and usually take longer.
  • dynamic: HDR/detail intensity. Higher values increase local contrast and texture emphasis.
  • creativity: How much the model is allowed to “invent” details beyond the source.
  • resemblance: How strongly output should remain faithful to the original image.
  • num_inference_steps: Sampling steps. More steps may improve detail but increase runtime.
  • handfix: Hand repair mode (disabled, hands_only, image_and_hands).
  • pattern: Enable seamless pattern mode for tileable textures.
  • output_format: Output image format (png, jpg, webp).

​
Usage Example

{
  "model": "image-upscale",
  "callback_url": "https://your-domain.com/api/callback",
  "input": {
    "img_urls": [
      "https://example.com/input.jpg"
    ],
    "prompt": "masterpiece, best quality, ultra detailed, realistic, sharp focus",
    "negative_prompt": "worst quality, low quality, blurry, noisy, artifacts",
    "scale_factor": 2,
    "dynamic": 6,
    "creativity": 0.3,
    "resemblance": 0.8,
    "num_inference_steps": 18,
    "handfix": "disabled",
    "output_format": "png"
  }
}

​
Query Task Status

After submitting a task, use the unified query endpoint to check progress and retrieve results:

Get Task Info

Learn how to query task status and retrieve generation results
For production use, we recommend using the callback_url parameter to receive automatic notifications when generation completes, rather than polling the status endpoint.

Models Overview

Explore all available models

Common API

Check credits and account usage

Authorizations

​
x-api-key
string
header
required

All APIs require authentication via API Key.

Get API Key:

  1. Visit API Key Management Page to get your API Key

Usage: Add to request header:

x-api-key: YOUR_API_KEY

Note:

  • Keep your API Key secure and do not share it with others
  • If you suspect your API Key has been compromised, reset it immediately in the management page

Body

application/json
​
model
enum<string>
required

The model name to use for this endpoint. Must be image-upscale.

Available options:
image-upscale
​
input
object
required

Input parameters for image upscale and enhancement.

​
callback_url
string<uri>

Optional. Callback URL for receiving task completion notifications.

Example:

"https://your-domain.com/api/callback"

Response

Request successful

​
code
enum<integer>

Response status code

  • 200: Success - Request has been processed successfully
  • 401: Unauthorized - Authentication credentials are missing or invalid
  • 402: Insufficient Credits - Account does not have enough credits to perform the operation
  • 404: Not Found - The requested resource or endpoint does not exist
  • 422: Validation Error - The request parameters failed validation checks
  • 429: Rate Limited - Request limit has been exceeded for this resource
  • 455: Service Unavailable - System is currently undergoing maintenance
  • 500: Server Error - An unexpected error occurred while processing the request
  • 501: Generation Failed - Content generation task failed
  • 505: Feature Disabled - The requested feature is currently disabled
Available options:
200,
401,
402,
404,
422,
429,
455,
500,
501,
505
​
message
string

Response message, error description when failed

Example:

"success"

​
data
object