This is correct. I would say there is still no PS alternative on Linux. I use Natron a lot for retouching but few people will know about or consider this becau

This is correct. I would say there is still no PS alternative on Linux. I use Natron a lot for retouching but few people will know about or consider this because it is aimed at film compositing. But if one wanted to create something better than PS on Linux, looking at professional compositing apps (Nuke, Fusion, etc.) and their OSS clones like Natron would probably be a good starting point.