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

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 2003-2021, 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)
2020-12-26 perl v5.32.1
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