user3774: 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!

user2994: Set an adjustment layer, mask it to cover what you want, use the Hue/Saturation color effect, and set the saturation to zero...then on your layer push the e key, and then select the stop watch next to the saturation of the effect. go to where you want it in color, and set the saturation amount.  Done

user3908: 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.

3774: <p>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.</p>

<p>Thanks a lot!</p>
 2994: <p>Set an adjustment layer, mask it to cover what you want, use the Hue/Saturation color effect, and set the saturation to zero...then on your layer push the e key, and then select the stop watch next to the saturation of the effect. go to where you want it in color, and set the saturation amount.  Done</p>
 3908: <p>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.</p>
