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docs: add per-tool API documentation and fix parity gaps
- Create 53 per-tool VitePress documentation pages with accurate parameters from Zod schemas, example requests, and response formats - Add root llms.txt for LLM-friendly repo browsing - Fix OpenAPI spec: add auth and 422 error schemas to edit-metadata/inspect and strip-metadata/inspect sub-routes - Fix tool count inconsistency (52 -> 53) across landing site, e2e tests, and local docs - Rename color-adjustments.ts to adjust-colors.ts to match tool ID - Update VitePress sidebar with all 8 tool categories and top nav
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description: Adjust brightness, contrast, saturation, temperature, hue, channels, and apply color effects.
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---
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# Adjust Colors
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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.
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## API Endpoint
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`POST /api/v1/tools/adjust-colors`
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Accepts multipart form data with an image file and a JSON `settings` field.
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## Parameters
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| Parameter | Type | Required | Default | Description |
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|-----------|------|----------|---------|-------------|
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| brightness | number | No | `0` | Brightness adjustment (-100 to 100) |
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| contrast | number | No | `0` | Contrast adjustment (-100 to 100) |
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| exposure | number | No | `0` | Exposure / midtone gamma (-100 to 100) |
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| saturation | number | No | `0` | Color saturation (-100 to 100) |
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| temperature | number | No | `0` | White balance: cool/blue to warm/orange (-100 to 100) |
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| tint | number | No | `0` | Tint shift: green to magenta (-100 to 100) |
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| hue | number | No | `0` | Hue rotation in degrees (-180 to 180) |
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| sharpness | number | No | `0` | Sharpening strength (0 to 100) |
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| red | number | No | `100` | Red channel level (0 to 200, 100 = unchanged) |
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| green | number | No | `100` | Green channel level (0 to 200, 100 = unchanged) |
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| blue | number | No | `100` | Blue channel level (0 to 200, 100 = unchanged) |
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| effect | string | No | `"none"` | Color effect: `none`, `grayscale`, `sepia`, `invert` |
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## Example Request
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```bash
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curl -X POST http://localhost:1349/api/v1/tools/adjust-colors \
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-H "Authorization: Bearer si_your-api-key" \
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-F "file=@photo.jpg" \
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-F 'settings={"brightness": 20, "contrast": 10, "saturation": -30, "effect": "none"}'
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```
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Apply a warm vintage look:
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```bash
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curl -X POST http://localhost:1349/api/v1/tools/adjust-colors \
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-H "Authorization: Bearer si_your-api-key" \
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-F "file=@photo.jpg" \
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-F 'settings={"temperature": 40, "saturation": -15, "contrast": 10, "effect": "sepia"}'
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```
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## Example Response
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```json
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{
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"jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
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"downloadUrl": "/api/v1/download/a1b2c3d4-e5f6-7890-abcd-ef1234567890/photo.jpg",
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"originalSize": 2450000,
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"processedSize": 2380000
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}
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```
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## Notes
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- All parameters default to neutral values so you can adjust only what you need.
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- Adjustments are applied in this order: brightness, contrast, exposure, saturation/hue, temperature/tint, sharpness, channels, effects.
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- Temperature uses a 3x3 color recombination matrix on the blue-orange and green-magenta axes.
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- Exposure maps to Sharp's gamma function (positive brightens midtones, negative darkens them).
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- 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`.
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- Output format matches the input format. HEIC, RAW, PSD, and SVG inputs are automatically decoded before processing.
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