docs: organize tool pages by modality under /tools/<modality>/

Move all 157 tool pages into image/video/audio/pdf/data subfolders so URLs read /tools/<modality>/<id> (e.g. /tools/image/crop). Nest the image sub-categories under an Image group in the sidebar so the nav reads by modality. Add public/_redirects (301, clean + .html forms) mapping every old flat /tools/<id> URL to its new path so inbound links keep working. Rewrite all internal /tools links. Verified with a clean docs build (no dead links).
2026-08-03 07:46:42 +02:00 · 2026-06-18 14:12:28 +08:00
parent 03c1a5e36f
commit d24e244af4
162 changed files with 874 additions and 554 deletions
@@ -0,0 +1,71 @@
+# PNG Transparency Fixer
+
+Fix fake transparent PNGs in one click. Uses AI matting (BiRefNet HR Matting model) to produce true alpha transparency, with defringe post-processing to clean up edges.
+
+## API Endpoint
+
+`POST /api/v1/tools/image/transparency-fixer`
+
+**Processing:** Asynchronous (returns 202, poll `/api/v1/jobs/{jobId}/progress` for status via SSE)
+
+**Model bundle:** `background-removal` (4-5 GB)
+
+## Parameters
+
+| Parameter | Type | Required | Default | Description |
+|-----------|------|----------|---------|-------------|
+| file | file | Yes | - | Image file (multipart) |
+| defringe | number | No | `30` | Defringe intensity (0-100). Removes semi-transparent fringe pixels around edges |
+| outputFormat | string | No | `"png"` | Output format: `png` or `webp` |
+| removeWatermark | boolean | No | `false` | Apply watermark removal pre-processing (median filter) |
+
+## Example Request
+
+```bash
+curl -X POST http://localhost:13490/api/v1/tools/image/transparency-fixer \
+  -F "file=@fake-transparent.png" \
+  -F 'settings={"defringe":40,"outputFormat":"png"}'
+```
+
+## Response
+
+### Initial Response (202 Accepted)
+
+```json
+{
+  "jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
+  "async": true
+}
+```
+
+### Progress (SSE at `/api/v1/jobs/{jobId}/progress`)
+
+```
+event: progress
+data: {"phase":"processing","stage":"Processing transparency...","percent":50}
+```
+
+### Final Result (via SSE)
+
+```json
+{
+  "phase": "complete",
+  "percent": 100,
+  "result": {
+    "jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
+    "downloadUrl": "/api/v1/download/{jobId}/fake-transparent_fixed.png",
+    "originalSize": 180000,
+    "processedSize": 150000,
+    "filename": "fake-transparent.png"
+  }
+}
+```
+
+## Notes
+
+- Requires the `background-removal` model bundle to be installed (4-5 GB).
+- Uses `birefnet-hr-matting` as the primary model for high-quality alpha matting. Falls back to `birefnet-general` if the HR model runs out of memory.
+- The `defringe` option removes semi-transparent fringe pixels that AI matting sometimes leaves around hair, fur, and fine edges. It works by blurring the alpha channel and zeroing out low-confidence pixels.
+- The `removeWatermark` option applies a median filter pre-processing step. It is a basic watermark reduction, not a dedicated watermark removal tool.
+- Only outputs PNG or lossless WebP (both support alpha transparency).
+- Supports HEIC/HEIF, RAW, TGA, PSD, EXR, and HDR input formats via automatic decoding.