Layer mode "colorize" (Feature request + patch)
This patch introduces a new layer mode hsl_colorize.
With uniform color layers, it behaves like applying the Color->Colorize command to the lower layer (but of course the upper layer can be filled with various colors in different places).
It's different from existing layer modes like hsl_color in two points:
- No single existing layer mode is (logically) working with all three values that can be set in the Colorize command. TO get a similar effect, multiple modifying layers would need to be prepared.
- More important, hsl_color etc. have a slightly different algorithm to determine the result - getting the exact same result as with the Colorize command is not possible.