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SnapOtter 7db6bb97da 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

2026-06-08 11:52:28 +08:00

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AI Canvas Expand

Expand the canvas of an image with AI-powered fill (outpainting). Extends the image in any direction and fills the new areas with AI-generated content that matches the existing image.

API Endpoint

POST /api/v1/tools/ai-canvas-expand

Processing: Asynchronous (returns 202, poll /api/v1/jobs/{jobId}/progress for status via SSE)

Model bundle: object-eraser-colorize (1-2 GB)

Parameters

Parameter	Type	Required	Default	Description
file	file	Yes	-	Image file (multipart)
extendTop	integer	No	`0`	Pixels to extend at the top
extendRight	integer	No	`0`	Pixels to extend at the right
extendBottom	integer	No	`0`	Pixels to extend at the bottom
extendLeft	integer	No	`0`	Pixels to extend at the left
tier	string	No	`"balanced"`	Quality tier: `fast`, `balanced`, `high`
format	string	No	`"auto"`	Output format: `auto`, `png`, `jpg`, `jpeg`, `webp`, `tiff`, `gif`, `avif`, `heic`, `heif`, `jxl`
quality	integer	No	`95`	Output quality (1-100)

At least one extend direction must be greater than 0.

Example Request

curl -X POST http://localhost:13490/api/v1/tools/ai-canvas-expand \
  -F "file=@photo.jpg" \
  -F 'settings={"extendTop":200,"extendBottom":200,"extendLeft":100,"extendRight":100,"tier":"balanced"}'

Response

Initial Response (202 Accepted)

{
  "jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
  "async": true
}

Progress (SSE at `/api/v1/jobs/{jobId}/progress`)

event: progress
data: {"phase":"processing","stage":"Expanding canvas...","percent":50}

Final Result (via SSE)

{
  "phase": "complete",
  "percent": 100,
  "result": {
    "jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
    "downloadUrl": "/api/v1/download/{jobId}/photo_extended.png",
    "previewUrl": "/api/v1/download/{jobId}/preview.webp",
    "originalSize": 300000,
    "processedSize": 520000
  }
}

Notes

Requires the object-eraser-colorize model bundle to be installed (1-2 GB).
Uses LaMa-based outpainting to generate content for the expanded regions.
The tier parameter trades speed for quality: fast produces results quickly with potential artifacts, high takes longer but produces smoother, more coherent fills.
Extend values are in pixels. The final image dimensions will be: original width + extendLeft + extendRight by original height + extendTop + extendBottom.
For non-browser-previewable output formats (HEIC, JXL, TIFF), a WebP preview is generated alongside the main output.
Supports HEIC/HEIF, RAW, TGA, PSD, EXR, and HDR input formats via automatic decoding.

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