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 2003-2024, 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 v5.38.2                                       2024-02-03                   Image::ExifTool::JPEGDigest(3pm)