Recently, I had to modify some icon-sprites. There was no Photoshop next to me, so I had to google a bit for color replacement tutorials for Gimp.
It appeared to be quite easy, although I still prefer using Photoshop for doing basic image manipulations, filtering and stuff.
In major window choose “Select” -> “By Color”.
Use the wand to get desired color you want to replace (use Control and Shift to increase/decrease replacement color regions). After you’re done with replacement area, navigate to “Colors” -> “Colorify…” and replace selected color.
Done!


