Image::...EGDigest(3)

💖 Image::...EGDigest(3) — bestie edition 💖

okay so this is a page from the User Contributed Perl Documentation section, manual name Image::...EGDigest(3). sit down, grab a strawberry, we're doing JPEG forensics ✨

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🌸 NAME 🌸

Image::ExifTool::JPEGDigest — it calculates JPEGDigest and JPEGQualityEstimate. that's it, that's the job, and it does it flawlessly 💅

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🎀 SYNOPSIS 🎀

This module is used by Image::ExifTool. no, like, used by used by. it's a supporting character, but honestly? main character energy anyway.

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✨ DESCRIPTION ✨

so here's the tea 🫖 — this module contains a lookup for values of the JPEG DQT digest, which lets you do some image identification from JPEG data alone. no extra files, no side quests, just the bytes.

It also calculates an estimated JPEG quality if requested. only if you ask though, she's not nosy 🙈

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👑 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. iconic behavior, we love a permissive license 🎀

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🔥 REFERENCES 🔥

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

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🦋 ACKNOWLEDGEMENTS 🦋

Thanks to Jens Duttke for most of the work that went into this module, and to Franz Buchinger for the values he added. two absolute legends, no cap 🌈

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⭐ SEE ALSO ⭐

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

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ngl this page is short but she ate and left no crumbs 💀 go read the SEE ALSO section, iykyk

perl v5.42.1 🌸 2026-03-31 🌸 and yeah, that's the footer of Image::...EGDigest(3) — thanks for coming to my ted talk, love u, bye bestie 💖✨