How to gradually colourize an object in after effects I'm rather new to AE but I believe I have the rotoscoping under control.
How can I gradually (each frame more) colourize an object in a video. So that at first the whole video is black and white and then one object starts to get more and more colour starting from a certain point and allow the colour to spread back to the whole object.

Thanks a lot!
I can't give you AE specifics, but one general method would be to have a mono layer and an otherwise identical color layer, keying the color over the mono using a matte layer that you draw on. As portions of the matte layer are turned white, or shades of white, the color layer is revealed.