I used Java 19. You can get it at https://adoptium.net/en-GB/temurin/releases/ if you don't have it. The build tool is Maven: https://maven.apache.org/download.cgi

Compile

mvn clean package

Use

For instructions:

java -jar target/colours-0.0.1-SNAPSHOT-jar-with-dependencies.jar

To process a 16-bit linear Rec2020 file, and write it as an sRGB file with TRC applied, use the following command (PNG and TIFF are supported, maybe others too -- this comes from Java, I did not spend time on I/O). Profiles are ignored, data is assumed to be in linear Rec2020. Floating point TIFFs are not supported. Note that only a base file name is needed for the output; the name of the mapper and the .png extension will be appended.

java -jar target/colours-0.0.1-SNAPSHOT-jar-with-dependencies.jar ~/tmp/dt-test/darktable_exported/0L0A3314.tif ~/tmp/dt-test/darktable_exported/0L0A3314 1 2 3 4 5 6

The result is:

Using RgbClippingGamutMapper
Wrote /home/kofa/tmp/dt-test/darktable_exported/0L0A3314-RgbClippingGamutMapper.png
Using BwFromLGamutMapper
Wrote /home/kofa/tmp/dt-test/darktable_exported/0L0A3314-BwFromLGamutMapper.png
Using DesaturatingLchBasedGamutMapperLchAb
Wrote /home/kofa/tmp/dt-test/darktable_exported/0L0A3314-DesaturatingLchBasedGamutMapperLchAb.png
Using DesaturatingLchBasedGamutMapperLchUv
Wrote /home/kofa/tmp/dt-test/darktable_exported/0L0A3314-DesaturatingLchBasedGamutMapperLchUv.png
Using ChromaClippingLchBasedGamutMapperLchAb
Wrote /home/kofa/tmp/dt-test/darktable_exported/0L0A3314-ChromaClippingLchBasedGamutMapperLchAb.png
Using ChromaClippingLchBasedGamutMapperLchUv
Wrote /home/kofa/tmp/dt-test/darktable_exported/0L0A3314-ChromaClippingLchBasedGamutMapperLchUv.png