1Image::ExifTool::JPEGDiUgseesrt(C3o)ntributed Perl DocumIemnatgaet:i:oEnxifTool::JPEGDigest(3)
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NAME

6       Image::ExifTool::JPEGDigest - Calculate JPEGDigest and
7       JPEGQualityEstimate
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SYNOPSIS

10       This module is used by Image::ExifTool
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DESCRIPTION

13       This module contains a lookup for values of the JPEG DQT digest,
14       allowing some image identification from JPEG data alone.  It also
15       calculates an estimated JPEG quality if requested.
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AUTHOR

18       Copyright 2003-2021, Phil Harvey (philharvey66 at gmail.com)
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20       This library is free software; you can redistribute it and/or modify it
21       under the same terms as Perl itself.
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REFERENCES

24       <https://github.com/ImageMagick/ImageMagick/blob/master/coders/jpeg.c>
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ACKNOWLEDGEMENTS

27       Thanks to Jens Duttke for most of the work that went into this module,
28       and to Franz Buchinger for the values he added.
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SEE ALSO

31       "JPEG Tags" in Image::ExifTool::TagNames, Image::ExifTool(3pm)
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35perl v5.32.1                      2021-04-26    Image::ExifTool::JPEGDigest(3)