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Controls the green to magenta color cast. Emitters in the real world not only emit bluer or more yellowish light, but can also emit a more greenish light, especially fluorescents. For this reason a complete white balancing tool also needs to control the green to magenta color cast in a photo. Negative values add a green tint, positive values add a magenta tint.
From left to right: Default white balance (6500K), colder
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render by setting the white point to 3000K, warmer render by setting the white point to 10 000K. Click to enlarge.