Image::ExifTool::JPEGDUsertContributed Perl DoImage::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 2003-2023, 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 v5.36.0 2023-02-24 Image::ExifTool::JPEGDigest(3pm)
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