Keyframe De-saturate Adjustment Layer?

[Michael Szalapski]

Yes, you can set keyframes for the master control. Read the manual, it’ll tell you how.

You could also just keyframe the opacity of your adjustment layer.
I, personally, prefer using Channel Mixer to desaturate footage. You can achieve a custom black and white mix when you click monochrome.

– The Great Szalam
(The ‘Great’ stands for ‘Not So Great)

No trees were harmed in the creation of this message, but several thousand electrons were mildly inconvenienced.

[Filip Vandueren]

for a Hue/Saturation plug-in that is a bit more logical in what and how you can keyframe, try “Color Balance (HLS)”
It lacks selective desaturation though. (eg. desaturate the reds only)