Script-Fu -> Warming or Cooling
This is an adjustable script.
Several selectable settings to render the tone of the image.
; This script should be placed ; in the user or system-wide script folder. ; ; Windows Vista/7/8/10) ; C:\Program Files\GIMP 2\share\gimp\2.0\scripts ; or ; C:\Users\YOUR-NAME\.gimp-2.8\scripts ; ; Windows XP ; C:\Program Files\GIMP 2\share\gimp\2.0\scripts ; or ; C:\Documents and Settings\yourname\.gimp-2.8\scripts ; ; Linux ; /home/yourname/.gimp-2.8/scripts