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17 PAUSE users
4 non-PAUSE users.

Phil Harvey
and 1 contributors

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 2003-2016, Phil Harvey (phil at owl.phy.queensu.ca)

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)