Image::ExifTool::JPEGDigest(3pm) - phpMan

Image::ExifTool::JPEGDigest(3pmUser Contributed Perl DocumentatioImage::ExifTool::JPEGDigest(3pm)

NAME
       Image::ExifTool::JPEGDigest - Calculate JPEGDigest and JPEGQualityEstimate

SYNOPSIS
       This module is used by Image::ExifTool

DESCRIPTION
       This module contains a lookup for values of the JPEG DQT digest, allowing some image
       identification from JPEG data alone.  It also calculates an estimated JPEG quality if
       requested.

AUTHOR
       Copyright 2003-2022, Phil Harvey (philharvey66 at gmail.com)

       This library is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself.

REFERENCES
       <https://github.com/ImageMagick/ImageMagick/blob/master/coders/jpeg.c>

ACKNOWLEDGEMENTS
       Thanks to Jens Duttke for most of the work that went into this module, and to Franz
       Buchinger for the values he added.

SEE ALSO
       "JPEG Tags" in Image::ExifTool::TagNames, Image::ExifTool(3pm)

perl v5.34.0                                2022-02-12           Image::ExifTool::JPEGDigest(3pm)

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