{
    "mode": "perldoc",
    "parameter": "Image::ExifTool::JPEGDigest",
    "section": "",
    "url": "https://www.chedong.com/phpMan.php/perldoc/Image%3A%3AExifTool%3A%3AJPEGDigest/json",
    "generated": "2026-06-09T12:33:46Z",
    "synopsis": "This module is used by Image::ExifTool",
    "sections": {
        "NAME": {
            "content": "Image::ExifTool::JPEGDigest - Calculate JPEGDigest and JPEGQualityEstimate\n",
            "subsections": []
        },
        "SYNOPSIS": {
            "content": "This module is used by Image::ExifTool\n",
            "subsections": []
        },
        "DESCRIPTION": {
            "content": "This module contains a lookup for values of the JPEG DQT digest, allowing some image\nidentification from JPEG data alone. It also calculates an estimated JPEG quality if requested.\n",
            "subsections": []
        },
        "AUTHOR": {
            "content": "Copyright 2003-2022, Phil Harvey (philharvey66 at gmail.com)\n\nThis library is free software; you can redistribute it and/or modify it under the same terms as\nPerl itself.\n",
            "subsections": []
        },
        "REFERENCES": {
            "content": "<https://github.com/ImageMagick/ImageMagick/blob/master/coders/jpeg.c>\n",
            "subsections": []
        },
        "ACKNOWLEDGEMENTS": {
            "content": "Thanks to Jens Duttke for most of the work that went into this module, and to Franz Buchinger\nfor the values he added.\n",
            "subsections": []
        },
        "SEE ALSO": {
            "content": "\"JPEG Tags\" in Image::ExifTool::TagNames, Image::ExifTool(3pm)\n",
            "subsections": []
        }
    },
    "summary": "Image::ExifTool::JPEGDigest - Calculate JPEGDigest and JPEGQualityEstimate",
    "flags": [],
    "examples": [],
    "see_also": [
        {
            "name": "ExifTool",
            "section": "3pm",
            "url": "https://www.chedong.com/phpMan.php/man/ExifTool/3pm/json"
        }
    ]
}