Line Art Prep and Color Flatting for Comics with Krita (PDF)

Step-by-step instructions for using the program Krita to remove blue lines from lineart, clean up the lineart, and use a really nifty tool called 'colorize mask' to automatically flat the lineart. Krita is a free and open-source digital painting program, download it here: https://krita.org/en/ 

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*NOTE: If you are working in CMYK color mode (instead of in RGB color mode, as described in the instructions,) use the "screen" mode anywhere that it instructs to use the "multiply" mode. To rephrase, use "screen" in CMYK, and "multiply" in RGB.