README.md

qt-jpegxl-image-plugin

Table of Contents

1. Description
2. Installation

Description

Qt plug-in to allow Qt and KDE based applications to read/write JXL images.

Work in progress experimental implementation using libjxl

Installation

1. Clone, build and install JPEG-XL

!Important! Clone must be --recursive to include third party packages

Code for download and compilation:

git clone --depth 1 https://gitlab.com/wg1/jpeg-xl.git --recursive
cd jpeg-xl
mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr -DJPEGXL_ENABLE_PLUGINS=ON -DBUILD_TESTING=OFF -DJPEGXL_WARNINGS_AS_ERRORS=OFF -DJPEGXL_ENABLE_SJPEG=OFF ..
make

Code for installation (run as root):

make install

2. Update mime database file

Check if the image-jxl.xml file was installed to /usr/share/mime/packages/ folder and run (as root):

update-mime-database /usr/share/mime/

3. Build qt-jpegxl-image-plugin

Download and build:

git clone --depth 1 https://github.com/novomesk/qt-jpegxl-image-plugin
cd qt-jpegxl-image-plugin
./build_libqjpegxl_dynamic.sh

Install (run as root):

make install

4. Add image/jxl to /usr/share/kservices5/imagethumbnail.desktop

1. Open /usr/share/kservices5/imagethumbnail.desktop with editor of your choise
2. Find line that starts with MimeType= and add image/jxl; to it's end, so line looks like MimeType=image/cgm; ... ;image/rle;image/avif;image/jxl;, save file.
3. Run update-desktop-database

Test

cd testfiles
gwenview jpegxl-logo.jxl

Expected result: