I almost forgot to fix this. There was some silly bug, which caused the evaluated new color values to overwrite the old ones. E.g. if your red function changed the red channel and if you use the red channel in the green or blue function, the calculation was way off.
Well, this is fixed now. Finally you can do stuff like custom grayscale functions. For example if you don't like the NTSC/PAL scheme, which is used by Effects->Color->Grayscale, you can now use a different one. For the ITU-R Recommendation BT.709 conversion you would use the following line for all three channels:
0.2125 * r + 0.7154 * g + 0.0721 * b
For comparison the NTSC/PAL one looks like this:
0.299 * r + 0.587 * g + 0.114 * b
Feel free to try your own weights. You can also try slightly heavier weights in the red channel and a tad heavier weights in the green channel for sepia-ish pseudo grayscale. Or something completely different. Since the calculated values are clamped (0 to 255), there won't be any problems.
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