On: Sct – set color temperature

[hrjet]

You can do it with a couple of lines of shell script too, using the xcalib utility:

https://gist.github.com/hrj/e9ed0d73d2daaa98b2d2

Been using that for more than an year with great results.

I also have another version of it: https://gist.github.com/hrj/6561271

(this version cuts the green and blue equally)