Ok, I made two plugins (available from the repository):
- colortemp: converts the color temperature of an image. You can specify the source temperature in K, or as the temperatue at which a black-body color best matches the selected foreground color. - whitebalance: converts the foreground color to either neutral gray, or to a specified background color. This is similar to grey-point, the difference being that the color transformation can be performed in the linear, rather than in the gamma-corrected, color space, and so may work better for removing color casts. I hope these can be useful to others! I was certainly very much in need for them, and I wonder why I was so lazy to learn script-fu only now (lack of documentation? nah, cannot be it ;-). Luca
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