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Image::ExifTool::JPEGDigest - Calculate JPEGDigest and JPEGQualityEstimate

Acknowledgements

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

Author

       Copyright 2003-2025, 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.

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.

Name

       Image::ExifTool::JPEGDigest - Calculate JPEGDigest and JPEGQualityEstimate

References

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

See Also

       "JPEG Tags" in Image::ExifTool::TagNames, Image::ExifTool(3pm)

perl v5.40.1                                       2025-03-16                   Image::ExifTool::JPEGDigest(3pm)

Synopsis

       This module is used by Image::ExifTool

See Also