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SnapOtter d24e244af4 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).

2026-06-18 14:12:28 +08:00

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description

description
Apply a two-color duotone effect with custom shadow and highlight colors.

Duotone

Apply a two-color duotone effect to an image. The image is converted to grayscale, then mapped to a gradient between the shadow color (dark tones) and the highlight color (bright tones).

API Endpoint

POST /api/v1/tools/image/duotone

Accepts multipart form data with an image file and a JSON settings field.

Parameters

Parameter	Type	Required	Default	Description
shadow	string	No	`"#1e3a8a"`	Shadow hex color (applied to dark tones)
highlight	string	No	`"#fbbf24"`	Highlight hex color (applied to bright tones)
intensity	integer	No	`100`	Effect intensity (0-100); 0 returns the original, 100 applies the full duotone

Example Request

curl -X POST http://localhost:1349/api/v1/tools/image/duotone \
  -H "Authorization: Bearer si_your-api-key" \
  -F "file=@photo.jpg" \
  -F 'settings={"shadow": "#0f172a", "highlight": "#f97316", "intensity": 80}'

Example Response

{
  "jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
  "downloadUrl": "/api/v1/download/a1b2c3d4-e5f6-7890-abcd-ef1234567890/photo.jpg",
  "originalSize": 2450000,
  "processedSize": 1870000
}

Notes

Output format matches the input format. HEIC, RAW, PSD, and SVG inputs are automatically decoded before processing.
An intensity of less than 100 blends the duotone result with the original image, allowing for subtler effects.
Popular duotone combinations include navy/gold, teal/coral, and purple/pink.

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