just been checking the after effects help file to generate a mask from alpha channels. i have a series of stills, a sequence of images actually, all of them have had the background removed in photoshop but the result wasn’t very good ,all the edges are jaggy. i have used autotres to generate the mask from the alpha, it works fine but i can’t apply mask expansion nor feather, i’ve converted all the keyframes to liner just to see if that way it would work but nothing.
can anyone tell me if it is posible to apply the expansion or feather please, the manual doesn’t actually say anything.
… but if you don’t mind expressions, you can pickwhip those properties on all masks (except Mask 1) to those properties on Mask 1.
1. Select Mask 1 & 2, hit MM to reveal mask properties.
2. Alt-click on the stopwatch for Mask 2’s Feather property, and pickwhip it to Mask 1’s Feather property.
3. Do the same for Mask 2’s Expansion Property.
4. Select Mask 2’s Feather Property, and its Expansion Property and select edit>copy expression only.
5. Select all the other masks (3 and onward), and select edit>paste. That pastes the two expressions to the other masks.
6. To adjust those properties for all masks, adjust them for Mask 1.
Have you considered opening the files in Photoshop, selecting the alpha channels, then applying something like a gaussian blur to them, effectively softening the edges? If you make an action of it, you can run it as a batch on your files and have them done while you’re making lunch or something 🙂
I had a similar problem this week and resolved it by running my files through PS. Lord knows I’m not too savvy with masking in AE and it seemed relatively easy (and got the job done the way I wanted to); I hadn’t thought of doing it the ways you and Steve had mentioned…how many ways are there to skin a cat? : )
But, believe me, I’m reading this post attentively to learn a lot more about ways of doing projects like this in the future without resorting to exporting to PS.
I can dig it. Usually ppl only bother batching through PS when it is something unique to PS. Obviously Gauss blur is in AE so you need look no further. You just probably have to pre-comp the layer after adding blur so the auto trace will read it as a complete rasterized image with the blur on it.