Coloring Tutorial 02: Fixing yellow-saturated bases
Made with GIMP 2.6
Using: Channels, Gradient Maps, Subtract Layers, Levels
Going from:
to 
As requested by
willstartariot on 
coloring_help.
Normalizing Yellow Bases in 7 easy steps
Using: Channels, Gradient Maps, Subtract Layers, Levels
Going from:
to 
As requested by
willstartariot on coloring_help.Normalizing Yellow Bases in 7 easy steps