While illustrating the panels for the “9th Wonders!” comic book are a snap for Sale - they’re executed in the traditional style, with pen and ink, then colored in later - the paintings proved to be trickier. Because he’s colorblind, Sale draws in black ink and dilutes his work for gray tones. To make his drawings look as if they were done with a paintbrush, the image is scanned into a computer. A colorist adds color, variations in tone and texture, and then the finished product is blown up and printed on canvas. (In a notable exception, the technicolor mushroom cloud on the floor of Isaac Mendez’s studio was printed on moveable rubber mats.)

You can read the whole interview at NY Post.