Codec comparison

This repository contains a set of scripts to compare lossy image codecs according to various automated image quality metrics.

Usage

To produce the plots, make sure the following packages (or their non-Debian equivalents) are installed:

imagemagick libavif-bin libimage-exiftool-perl octave-image octave-statistics python3-poetry tup

And that the following binaries are placed in tools/:

• from libjxl: butteraugli_main cjpegli djpegli cjxl djxl ssimulacra2

• from https://github.com/thorfdbg/libjpeg: jpeg

Then, place the images to be assessed in images/ as Rec. 2020 / PQ 16-bit PNGs, and run:

poetry install --no-root
tup

After a while, the plots should be in plots/ in PNG and SVG formats. (The output formats can be changed by modifying @plot_formats in commands.pl and rerunning tup. For example, pdf can be added if desired, e.g. for inclusion in a LaTeX document.)