Limit Effect in Color Corrector 3-Way won't select Chroma in FCP7

I'm trying to use the eyedropper in the "Limit Effect" section of the CC 3-way filter to select a color in my shot (there's some redness I'm trying to tone down), but it won't let me select anything on the Chroma scale. Even if I have the box checked for that and unchecked for Saturation and Luma, when I try to select the color in the shot with the eyedropper, FCP automatically unchecks the Chroma box and checks the Sat and Luma boxes, and adjusts those scales from the eyedropper, while leaving the Chroma scale unadjusted.



I can't find anything about this in the tutorials I've been following, and this doesn't make sense why it would do this, so any help would be really appreciated.

Thanks!

this function has broken for me under Yosemite.

in fact eyedropper behaviour is broken in general.

in generators, the presented eyedropper wont work,
but clicking on the colour swatch opens the new-look Yosemite colour picker,
and the eyedropper in that window DOES work.

BUT that isn't an option in the Colour Correction filters

colour matching has to be done manually now.

when limiting effect manually it can help to switch the view to just the key
that's a key icon on the right of the limit effect area.
it's got 3 modes:

final view
key
no effect (i think? not sure what this 3rd one is about)



nick