Seams and hard edges
Melt a hard line into the colours around it
Soften the edge with Blur, then run the Blend brush over it. Blend turns the border into a smooth gradient between the colours on both sides, without smearing paint along the stroke.
- Works straight across UV seams, because both sides are next to each other on the model.
- Perceptual colour mixing, so transitions don't go grey or muddy in the middle.
- Seam padding keeps thin lines from showing up in mip maps.