I need to convert some stock icon imagery to a pre-existing colour scheme. The method for conversion is to simply adjust the image hue to the right level.
However all I have to go on is existing imagery that has already undergone the process. As such, I know that the muddy green of
99b963 should become the dull mauve of
My current method is trial and error: I zoom in to an area of green, overlay a layer featuring an adjacent pixel of the target mauve, select the original layer, then adjust saturation until it looks right. At that point I step out of the adjustment dialogue, get the color picker out, and compare. Repeat until just right.
Does Photoshop / Gimp / Paint.NET have a simpler, procedural method for achieving this, in 1 step if possible? If not, is there a less trial-and-error method to achieve the right hue given a target colour difference?