I need a little bit of help, I am working on a project where I have multiple green screen layers and I need one of them to be temporarily black and white ( I need to animate the opacity of that effect ) but I'm working in CS5 so compositing options does not appear. I tried an adjustment layer but as you know it effects all the layers! Help please!! :)
"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."
---THOMAS EDISON on inventing the light bulb.
Rather than trying to do this with one layer, I would think it easier to use a copy of the keyed layer set to combined matte and adjusting the opacity. Unless there's a reason you don't want to do it that way.