From the course: After Effects Apprentice: 13 Paint Roto and Puppet

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Finishing the reveal

Finishing the reveal - After Effects Tutorial

From the course: After Effects Apprentice: 13 Paint Roto and Puppet

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Finishing the reveal

In the previous movie, you created an animated stroke in the layer's Alpha Channel. If I bring the Layer panel forward and scrub its timeline, I have painted an animated white stroke in the Alpha Channel. Because the layer is black and outside the layer is also black, I'm simply extending the Alpha Channel beyond the original source. And if the layer you are using is an interesting image, outside of that Alpha Channel might look quite strange, and we covered why that is in an earlier movie. Now we need to finish off this effect so that the stroke wipes on the original layer. I have the Composition panel on the left. I will set it to 100% so you can see what's going on more clearly. I still have my Project panel. I'll just tidy up my workspace. I will select the layer and then select either F3 or open Effect>Effect Controls. And you will see that paint is an effect with just one parameter; Paint on Transparent. You will also notice that it does appear in the timeline, if you twirl up…

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