Image::ExifTool::JPEGDigest(3)             User Contributed Perl Documentation


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 2003-2024, 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 v5.38.2                      2024-04-05    Image::ExifTool::JPEGDigest(3)