here's how it's done.
there's a tone layer made of 256-levels-of-grayscale pixels. if you assign a flat region (on a different layer) a color pair and it has tones underneath it, it uses that to render a dither pattern.
there's a tone layer made of 256-levels-of-grayscale pixels. if you assign a flat region (on a different layer) a color pair and it has tones underneath it, it uses that to render a dither pattern.