Say I have the following image:
I want to tint the yellow parts on this sprites shoulder/arms by a random color. In other questions on this site, they suggest using a chroma key and replacing the constant color with whatever color I wanted, but that solution wouldn't keep the gradient.
The other solution I've seen is that I should cut out the part I want to change the color of and make it an overlay. That would work, but would require a lot of effort since I have many poses for this character + animations.