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So you have a image file and you want to replace a color with other (e.g. yellow with red and white blue):
You have Gimp and you don’t know how to do it. It happens sometime, especially to me.
But here it is how you can do it:
- make sure that you image’s mode is RGB (menu Image > Mode > RGB)
- select Color > Map > Rotate Colors
- you have he source (From) color panel and the destination color panel (To); use those two arrows inside the color wheel and rotate them (counter) clockwise until you get the color you want