1) duplicate the original layer, in this example a scenic with a strong red cast
2) Apply Filter>Blur>Average to get ...
... a layer of just one color - the color cast with RGB values of 123:108:118
3) Invert the color layer ...
... to get the complementary (opposite) color with RGB values of 114:148:138
4) Blend Color mode
... to get the complementary (opposite) color with RGB values of 114:148:138
4) Blend Color mode
5) Change opacity to 10-40%
6) If it looks 'flat' add a bit of saturation. As this looks ok to me, I did not add any saturation. Compare the color cast removed version (this one) with the original in step 1 above.
Based on a presentation to the Berkeley Camera Club by Bernadette Talbot
A nice YouTube 'how to' by Tim Grey at http://www.youtube.com/watch?v=UAQsOeCCrAY
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