How do I fill and avoid smooth brush screwing things up?

[Jonathan790]

Any tips? See picture, as you can see the black shadow is messed up as I fill it due to having used a smooth ink tool to draw the lines. Fuzzy select + grow kind of helps but then you lose the benefit of the smooth edges.

[denzjos]

I don't know about the original picture, but you can select the yellow with the 'Fuzzy Select Tool', then 'Select / To Path' , then 'Select / None' and 'Stroke Path' with a small line (tick 'Antialiasing')

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[rich2005]

Probably one for the future but there is a bucket fill 'line art' option for filling areas without the anti-aliasing.

   

example: https://i.imgur.com/tyYLNb8.mp4

[Ofnuts]

Not only the black shadow, you also have gaps between yellow and black.

This should be avoided by using the adequate painting technique:

• Make what you want to paint transparent (if not already so) using Color-To-Alpha or Color Erase mode.
  
• This will create edges with partially transparent pixels
  
• Fill the inside with a  paint tool in Behind mode, it will fully paint the fully transparent pixels and "complement" the partially transparent ones exactly as needed.
  

See here for a more detailed explanation.