Video tutorial,if you can't see it, here is the link on Youtube

Here is a video tutorial to show you how to use a complex GMIC filter named : Colorize lineart [smart-coloring]. I'm using this filter to ease and speedup my workflow with flatting the color of my webcomic Pepper&Carrot. This filter is available on recent version of Krita, specifically the one with the GMIC-Qt plugin.