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Knowing how to effectivly work in RGB color (monitor/light/additive) and CMYK color(print/pigment/subtractive) is a necessesaty for anyone serious about working in digital illustration.
This tutorial shows how to create an RGB pallet of colors that will reproduce well when the image is switched to CMYK to be in order to be printed.
Removing the White Background from a Line Drawing
One of the most common requests