When you set colorMode(HSB) and set a color like stroke(360,100,100,0.1), the fourth parameter 0.1 works well as the alpha value.
The issue is that when you try to access a value called stroke(360,100,100,0), then the color appear to have no transparency at all, which means alpha = 1, and the color appear the same as (360, 100, 100, 1).
I think normally with alpha = 0 it means there be some 100% transparency and no color at all.
lmccart
commented
8 years ago
When you set colorMode(HSB) and set a color like stroke(360,100,100,0.1), the fourth parameter 0.1 works well as the alpha value.
The issue is that when you try to access a value called stroke(360,100,100,0), then the color appear to have no transparency at all, which means alpha = 1, and the color appear the same as (360, 100, 100, 1).
I think normally with alpha = 0 it means there be some 100% transparency and no color at all.