Image::ExifTool::JPEGDigest
Section: User Contributed Perl Documentation (3)
Updated: 2021-01-27
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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 2003-2021, 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.
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)