Enhance > Adjust Color > Hue/SaturationAnd move the Hue slider. See also http://davekb.com/browse_computer_tips:gimp_replace_colors:txt
Computer Tips - How can I make a mostly red image mostly green using Photoshop?
Date: 2012apr13
Product: Photoshop
Q. How can I make a mostly red image mostly green using Photoshop?
(Change the color of an image using Photoshop)
A. From the menu do: