Image::ExifTool::JPEGDigest

Section: User Contributed Perl Documentation (3)
Updated: 2019-10-10
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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 2003-2019, 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)


 

Index

NAME
SYNOPSIS
DESCRIPTION
AUTHOR
REFERENCES
ACKNOWLEDGEMENTS
SEE ALSO
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