One of the things krita could benefit from is a way to make watercolor edges (not simulated watercolor), but wet edges to brush presets. It would give an illusion of watercolor without the hassle of programming watercolor effects. I think most people who work in comics or cartoon illustration would love to have this option available to them using the best illustration tool around now, Krita. Photoshop, painter and many others have this option and I feel Krita would only become greater from it's inclusion as well. Thank you friends. :) Reproducible: Always
That's what Raph Levien calls a high-pass filter over the stroke: http://www.levien.com/gimp/brush-arch.html
Good read, yes something like that.
*** This bug has been marked as a duplicate of bug 347920 ***