Confused question/feature request?? about blending

[daifkyou]

I'm fairly new to colours so I might just be stupid but after skimming that Compositing and Blending Level 1 thing mentioned in the docs here is my current understanding:

• the Blend trait has blend modes which only work on RGB.
• the Compose trait represents compositing which works on any colour with only stimulus channels and alpha.
• Colours are first blended and then modulated by the backdrop alpha to produce an intermediate colour which is then composited onto the backdrop using some Porter-Duff composition operator.

However, it seems to me after messing around a bit that Blend seems to automatically apply source-over?
Can I choose a different operator?
Is this how colours work?

[Ogeon]

Hi, you seem to have the right idea and there's unfortunately no way to change the composition step at the moment. It could potentially be possible to expose the blend functions separately.

Also, those blending and composition functions are specified for RGB, so the possibility to use other spaces is a generalization of them in Palette. Aesthetic results may vary.