Adjust Colors
Comprehensive color adjustment tool combining brightness, contrast, exposure, saturation, temperature, tint, hue rotation, per-channel levels, and one-click effects (grayscale, sepia, invert) in a single endpoint.
API Endpoint
POST /api/v1/tools/adjust-colors
Accepts multipart form data with an image file and a JSON settings field.
Parameters
| Parameter | Type | Required | Default | Description |
|---|---|---|---|---|
| brightness | number | No | 0 | Brightness adjustment (-100 to 100) |
| contrast | number | No | 0 | Contrast adjustment (-100 to 100) |
| exposure | number | No | 0 | Exposure / midtone gamma (-100 to 100) |
| saturation | number | No | 0 | Color saturation (-100 to 100) |
| temperature | number | No | 0 | White balance: cool/blue to warm/orange (-100 to 100) |
| tint | number | No | 0 | Tint shift: green to magenta (-100 to 100) |
| hue | number | No | 0 | Hue rotation in degrees (-180 to 180) |
| sharpness | number | No | 0 | Sharpening strength (0 to 100) |
| red | number | No | 100 | Red channel level (0 to 200, 100 = unchanged) |
| green | number | No | 100 | Green channel level (0 to 200, 100 = unchanged) |
| blue | number | No | 100 | Blue channel level (0 to 200, 100 = unchanged) |
| effect | string | No | "none" | Color effect: none, grayscale, sepia, invert |
Example Request
bash
curl -X POST http://localhost:1349/api/v1/tools/adjust-colors \
-H "Authorization: Bearer si_your-api-key" \
-F "[email protected]" \
-F 'settings={"brightness": 20, "contrast": 10, "saturation": -30, "effect": "none"}'Apply a warm vintage look:
bash
curl -X POST http://localhost:1349/api/v1/tools/adjust-colors \
-H "Authorization: Bearer si_your-api-key" \
-F "[email protected]" \
-F 'settings={"temperature": 40, "saturation": -15, "contrast": 10, "effect": "sepia"}'Example Response
json
{
"jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
"downloadUrl": "/api/v1/download/a1b2c3d4-e5f6-7890-abcd-ef1234567890/photo.jpg",
"originalSize": 2450000,
"processedSize": 2380000
}Notes
- All parameters default to neutral values so you can adjust only what you need.
- Adjustments are applied in this order: brightness, contrast, exposure, saturation/hue, temperature/tint, sharpness, channels, effects.
- Temperature uses a 3x3 color recombination matrix on the blue-orange and green-magenta axes.
- Exposure maps to Sharp's gamma function (positive brightens midtones, negative darkens them).
- This endpoint also responds at the legacy paths
/api/v1/tools/brightness-contrast,/api/v1/tools/saturation,/api/v1/tools/color-channels, and/api/v1/tools/color-effects. - Output format matches the input format. HEIC, RAW, PSD, and SVG inputs are automatically decoded before processing.