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SnapOtter 8532f3227b docs: audit all 157 tool pages against live schemas

Reconcile every tool page's parameters, defaults, and response shape against the tool's Zod settings schema and executionHint in code. Notable fixes: color-palette (add count + format params, hex output, median-cut algorithm), favicon (add 5 params, was documented as having none), qr-generate (add logoDataUri), convert (add ppm/eps/tga formats), video-loudnorm (-16 LUFS not -14), smart-crop (async 202 not sync 200), images-to-video (1080x1080 square), and several output-filename and behavior-note corrections.

Also normalize API endpoint paths to /api/v1/tools/<id> (no modality segment) and standardize curl examples on the Docker API port 1349. Verified with a clean docs build.

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

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description

description
Generate an RGB histogram chart with per-channel statistics from an image.

Histogram

Generate an RGB histogram chart from an image. Returns a PNG histogram image along with per-channel statistics and raw 256-bin histogram data in the response JSON.

API Endpoint

POST /api/v1/tools/histogram

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

Parameters

Parameter	Type	Required	Default	Description
scale	string	No	`"linear"`	Y-axis scale: `linear` or `log`

Example Request

curl -X POST http://localhost:1349/api/v1/tools/histogram \
  -H "Authorization: Bearer si_your-api-key" \
  -F "file=@photo.jpg" \
  -F 'settings={"scale": "linear"}'

Example Response

{
  "jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
  "downloadUrl": "/api/v1/download/a1b2c3d4-e5f6-7890-abcd-ef1234567890/histogram.png",
  "originalSize": 2450000,
  "processedSize": 12000,
  "bins": {
    "r": [0, 12, 45, "... (256 values)"],
    "g": [0, 8, 38, "... (256 values)"],
    "b": [2, 15, 52, "... (256 values)"],
    "lum": [0, 10, 40, "... (256 values)"]
  },
  "stats": {
    "r": { "mean": 128, "median": 132, "stdev": 48.5 },
    "g": { "mean": 119, "median": 121, "stdev": 44.2 },
    "b": { "mean": 105, "median": 108, "stdev": 51.3 },
    "lum": { "mean": 118, "median": 120, "stdev": 45.1 }
  },
  "mean": { "r": 128, "g": 119, "b": 105 },
  "max": { "r": 4200, "g": 3800, "b": 4100 }
}

Notes

The downloadUrl points to a rendered PNG histogram chart showing the R, G, B, and luminance distributions.
bins contains raw 256-value arrays for each channel (red, green, blue, luminance), suitable for rendering custom visualizations.
stats provides mean, median, and standard deviation per channel.
mean and max are backward-compatible shorthand fields.
Use log scale when the histogram is dominated by a few peaks and you want to see detail in the lower bins.
HEIC, RAW, PSD, and SVG inputs are automatically decoded before analysis.

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