---
name: "Image::ExifTool::JPEGDigest"
section: "3pm"
platform: "linux"
package: "perl-image-exiftool"
version: "13.55-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/Image::ExifTool::JPEGDigest"
---

# Image::ExifTool::JPEGDigest(3pm)

Calculate JPEGDigest and JPEGQualityEstimate

## 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 2003-2026, 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)](/Image::ExifTool/3pm.md)