Image::ExifTool::JPEGDigest − Calculate JPEGDigest and JPEGQualityEstimate
This module is used by Image::ExifTool
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.
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.
<https://github.com/ImageMagick/ImageMagick/blob/master/coders/jpeg.c>
Thanks to Jens Duttke for most of the work that went into this module, and to Franz Buchinger for the values he added.
"JPEG Tags" in Image::ExifTool::TagNames, Image::ExifTool(3pm)