MyPaint is awesome; it’s my daily driver right now. But the biggest issue I have with it is breaking my workflow every time I want to adjust the hue, brightness, etc. on the layer. It’s a bit easier with post-processing (blur, tilt shift, etc.) because I don’t have to go back to mypaint to change anything, but if it’s possible it would be good to have as well.
I may be wrong, but perhaps some of the code from the display filters could be used here, since it has a similar effect, but that could just be affecting rendering. I’m not that familiar with the underlying code in MyPaint (although I am trying to learn it), so I can’t really say what other challenges would be encountered.
- Infinite Painter (android) has the best implementation of this I have ever seen, period. Very intuitive, and easy to pick up. Most of the features on it are probably out of scope, but the general design is a good model to look to.
- Krita also has this in the Filter menu.
- And GIMP’s Colors / Filters tabs, of course