[Interest] Google "guetzli" JPEG encoder Qt image plugin

Till Oliver Knoll till.oliver.knoll at gmail.com
Tue Apr 11 09:47:22 CEST 2017

Hi all,

A simple QImageIOPlugin based JPEG "Guetzli" encoder is available here:


Guetzli-generated images are typically 20-30% smaller than images of equivalent quality generated with libjpeg. All credits go to Google Research Europe here. Also refer to https://research.googleblog.com/2017/03/announcing-guetzli-new-open-source-jpeg.html?m=1

The plugin supports writing JPEG images with the "quality" option (lowest possible value: 84). It takes a lot of CPU time and memory, so feel free to experiment :)

The plugin is currently developed on macOS, Windows 10 (MinGW) and FreeBSD using (at least) Qt 5.6.2 (lower 5.x Qt releases work probably, too), using the Qt Open Source License LGPL 3. The Google Guetzli encoder comes with its own Apache License 2.0.

Have fun,

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