Dear All, I have just uploaded to the Gimp plug-in repository a plug-in that enables you to modify the color temperature of a photo. I can be used to correct the bluish cast in overcast photos, or even (to some extent) the red cast in photos taken under incandescent light with the camera set to daylight. At least for me, the plugin works better than playing around with the levels and curves menus by hand, in part because the color transformations are done in the linear (rather than gamma-corrected) color space, and use black-body color temperature as reference.
Anyway, I had been wishing for a long time for a tool to modify the color temperature of an image, and now there is one! http://registry.gimp.org/plugin?id=8730 I hope it can be useful to others! Give it a try, it has extensive help included. All the best, Luca
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