Trying to work out a 'cel filling' system, for details that are not very important.
I consider this a moderate success:

<- input

<- output
3 step process:
1. Draw the 'cel' borders (the 'input' image seen above)
2. GMIC Repair->Inpaint[Solidify] . type=Morphological. This effects all transparent pixels in the current layer, assuming there is not a selection active.
3. GMIC Repair->Anisotropic smoothing. amplitude=8,anisotropy=1,tensor smoothness=1.3. de-coarsens the result a little.
Pretty fast, even including filter run time. I feel happy about this because it helps me focus on structure rather than cosmetic effects for unimportant elements.
« Last Edit: February 10, 2014, 06:27:24 am by Ai »

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If you insist on being pessimistic about your own abilities, consider also being pessimistic about the accuracy of that pessimistic judgement.