{
  "title": "Image histogram inspector",
  "human_url": "https://happytails.ai/en/image-tools/image-histogram-inspector/",
  "agent_url": "https://happytails.ai/agents/en/image-tools/image-histogram-inspector/",
  "language": "en",
  "markdown_url": "https://happytails.ai/en/image-tools/image-histogram-inspector.md",
  "content": "Image histogram inspector\nSee how tones and colors are distributed in your image. Export the complete channel counts and a luminance chart.\nHow can we improve this tool?\nReport a problem or share an idea.\nPlease leave out private information. Your message and the tool name go to our team via PostHog.\nHow to use Image histogram inspector\nChoose a still image.\nChoose whether to exclude fully transparent pixels.\nInspect the histogram and download the chart, table or report.\nUseful next steps\nImage to ASCII art\nReplace image color\nEvery channel, every bin\nThe table and report contain 256 bins for red, green, blue, luminance and alpha. The chart displays luminance. Every included pixel contributes once to each distribution.\nWhat the endpoints mean\nPixels at the minimum or maximum channel value are counted, but those counts cannot prove that the original scene was clipped. Luminance is computed from decoded encoded RGB.",
  "content_format": "text/plain",
  "visibility": "public",
  "links": [
    {
      "name": "Image to ASCII art",
      "url": "https://happytails.ai/en/image-tools/image-to-ascii-art/"
    },
    {
      "name": "Replace image color",
      "url": "https://happytails.ai/en/image-tools/image-color-replacement/"
    }
  ],
  "tool": {
    "id": "image-histogram-inspector",
    "category": "image-tools",
    "built": true,
    "requirements": "Files stay in this browser. Use still PNG, JPEG or WebP images, up to 20 MiB per file, 40 MiB combined and 16 million decoded pixels combined. Outputs total at most 100 MiB. Processing stops after 30 seconds. Source metadata and color profiles are not copied.",
    "implementation": {
      "fields": [
        {
          "key": "excludeTransparent",
          "label": "Exclude fully transparent pixels",
          "value": true,
          "type": "checkbox"
        }
      ],
      "registrationFamily": "raster-image-studio",
      "files": true,
      "input": false,
      "multiple": false,
      "accept": ".png,.jpg,.jpeg,.webp",
      "maxFileBytes": 20971520,
      "deferImagePreview": true,
      "note": "Files stay in this browser. Use still PNG, JPEG or WebP images, up to 20 MiB per file, 40 MiB combined and 16 million decoded pixels combined. Outputs total at most 100 MiB. Processing stops after 30 seconds. Source metadata and color profiles are not copied.",
      "experience": {
        "automatic": false,
        "single": false,
        "inputMaxLength": 1000000,
        "inputMode": "text",
        "label": "Your text",
        "placeholder": "Type or paste your input…",
        "help": "Up to 1,000,000 characters. Review the settings before running.",
        "action": null
      },
      "mode": "explicit",
      "interactive": false
    },
    "execution": "Browser interface",
    "api": null,
    "browser_agent": {
      "supported": true,
      "name": "run_current_tool",
      "discovery": "WebMCP on the human page in a supporting browser",
      "verification": "See audit/API-AUDIT.md; availability is not verification"
    }
  },
  "markdown": "# Image histogram inspector\n\n- Human page: https://happytails.ai/en/image-tools/image-histogram-inspector/\n- Markdown: https://happytails.ai/en/image-tools/image-histogram-inspector.md\n- Structured JSON: https://happytails.ai/agents/en/image-tools/image-histogram-inspector/index.json\n- Visibility: public\n\n## Tool capabilities\n\n| Property | Value |\n| --- | --- |\n| Tool ID | `image-histogram-inspector` |\n| Category | image-tools |\n| Implementation | Registered implementation. Registration alone is not a production-quality guarantee. |\n| Browser execution | Use the visible action or interactive controls. |\n| Browser processing | Browser; see tool notes for network behavior. |\n| HTTP API | Not callable through HTTP. |\n| Browser-agent interface | run_current_tool |\n\n### Implementation notes\n\nFiles stay in this browser. Use still PNG, JPEG or WebP images, up to 20 MiB per file, 40 MiB combined and 16 million decoded pixels combined. Outputs total at most 100 MiB. Processing stops after 30 seconds. Source metadata and color profiles are not copied.\n\n### Inputs and settings\n\nNo free-text input is required. Use the file inputs and/or settings below.\n\nAccepted browser files: `.png,.jpg,.jpeg,.webp`. Choose one file.\n\nBrowser file-input limit: 20971520 bytes in total. HTTP limits can differ.\n\n| Setting | Meaning | Control type | Default | Constraints |\n| --- | --- | --- | --- | --- |\n| `excludeTransparent` | Exclude fully transparent pixels | checkbox | true |  |\n\n### Browser-agent workflow\n\n1. Open the human page in a browser that supports WebMCP.\n2. Discover the interface exposed by that page; use its actual schema.\n3. Select files on the page first when the tool requires files.\n4. Call `run_current_tool` with valid input and settings.\n5. Inspect the returned result or error and the displayed output. Retrieve files from the displayed download links.\n\nCalls do not automatically copy or download results. Browser permissions still apply. Interface availability alone is not proof of successful execution.\n\n### Planning specification\n\nFiles stay in this browser. Use still PNG, JPEG or WebP images, up to 20 MiB per file, 40 MiB combined and 16 million decoded pixels combined. Outputs total at most 100 MiB. Processing stops after 30 seconds. Source metadata and color profiles are not copied.\n\nThis describes intended requirements. Use the implementation notes, interface schema and observed output to determine current support.\n\n### Complete machine-readable capability record\n\n```json\n{\n  \"id\": \"image-histogram-inspector\",\n  \"category\": \"image-tools\",\n  \"built\": true,\n  \"requirements\": \"Files stay in this browser. Use still PNG, JPEG or WebP images, up to 20 MiB per file, 40 MiB combined and 16 million decoded pixels combined. Outputs total at most 100 MiB. Processing stops after 30 seconds. Source metadata and color profiles are not copied.\",\n  \"implementation\": {\n    \"fields\": [\n      {\n        \"key\": \"excludeTransparent\",\n        \"label\": \"Exclude fully transparent pixels\",\n        \"value\": true,\n        \"type\": \"checkbox\"\n      }\n    ],\n    \"registrationFamily\": \"raster-image-studio\",\n    \"files\": true,\n    \"input\": false,\n    \"multiple\": false,\n    \"accept\": \".png,.jpg,.jpeg,.webp\",\n    \"maxFileBytes\": 20971520,\n    \"deferImagePreview\": true,\n    \"note\": \"Files stay in this browser. Use still PNG, JPEG or WebP images, up to 20 MiB per file, 40 MiB combined and 16 million decoded pixels combined. Outputs total at most 100 MiB. Processing stops after 30 seconds. Source metadata and color profiles are not copied.\",\n    \"experience\": {\n      \"automatic\": false,\n      \"single\": false,\n      \"inputMaxLength\": 1000000,\n      \"inputMode\": \"text\",\n      \"label\": \"Your text\",\n      \"placeholder\": \"Type or paste your input…\",\n      \"help\": \"Up to 1,000,000 characters. Review the settings before running.\",\n      \"action\": null\n    },\n    \"mode\": \"explicit\",\n    \"interactive\": false\n  },\n  \"execution\": \"Browser interface\",\n  \"api\": null,\n  \"browser_agent\": {\n    \"supported\": true,\n    \"name\": \"run_current_tool\",\n    \"discovery\": \"WebMCP on the human page in a supporting browser\",\n    \"verification\": \"See audit/API-AUDIT.md; availability is not verification\"\n  }\n}\n```\n\n## Page guide\n\nSee how tones and colors are distributed in your image. Export the complete channel counts and a luminance chart.\n\nHow can we improve this tool?\n\nReport a problem or share an idea.\n\nPlease leave out private information. Your message and the tool name go to our team via PostHog.\n\n### How to use Image histogram inspector\n\n1. Choose a still image.\n2. Choose whether to exclude fully transparent pixels.\n3. Inspect the histogram and download the chart, table or report.\n\n## Useful next steps\n\n- [Image to ASCII art](https://happytails.ai/en/image-tools/image-to-ascii-art/) ([Markdown](https://happytails.ai/en/image-tools/image-to-ascii-art.md))\n\n- [Replace image color](https://happytails.ai/en/image-tools/image-color-replacement/) ([Markdown](https://happytails.ai/en/image-tools/image-color-replacement.md))\n\n## Every channel, every bin\n\nThe table and report contain 256 bins for red, green, blue, luminance and alpha. The chart displays luminance. Every included pixel contributes once to each distribution.\n\n### What the endpoints mean\n\nPixels at the minimum or maximum channel value are counted, but those counts cannot prove that the original scene was clipped. Luminance is computed from decoded encoded RGB.\n"
}