Lay flat color under the line you drew
Fill shapes you closed, on a layer beneath the ink. A colorize mask is only a first pass.
Flats are a craft decision: which shapes share a color, where the gap in the line is on purpose. Software fills faster. It should not choose the picture.
Tools
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Clip Studio Paint
Fill tools and refer-to-other-layers so flats stay under your ink.
Krita
Colorize Mask can rough in flats from scribbles. You still choose the colors.
Procreate
ColorDrop and reference layers for filling by hand on iPad.
How to do it
- 1
Put the line on top
Set the ink layer to multiply, or use the transparent-line file from the scan workflow. Lock it.
- 2
Close gaps you mean to close
In Clip Studio, set the fill to refer to the line layer and use a small gap setting. In Procreate, use ColorDrop on a layer below. Paint across gaps you want to stay open.
- 3
Optional rough pass
In Krita, a Colorize Mask can spread color from a few scribbles. Treat the result as a stain. Paint the edges yourself before you call it flats.
- 4
Name the layers
Skin, cloth, background. Future you, and anyone who inherits the file, should see the decisions.