Okay so sorry about the title I had no idea how to word it.
Heres what I'm doing. I'm taking a video, and sketching over it frame by frame. In this instance its a little rat running across the screen.
So I'm using photoshop to do the animation, I import the video to frames, convert to video timeline, and draw over using a pencil brush for say, 200 odd frames. I've then got a lovely little animation of the rat running across the screen, which is lovely.
The problem comes when the rat runs in front of something else I've drawn, as it isnt opaque. I dont know how to solve this problem. After I've finished the animation in Photoshop - I then import the PSD into photoshop and add the final touches in there.
So far the only solutions I've come up with are:
In after effects, using a solid layer and animating a mask shape behind the rat. However if I make the slightest change to the PSD and have to import it again into AE, the timing gets completely thrown out, which means all that hard word I put into the mask is useless. And even then, It's not a perfect representation of the overall shape of the rat, as I'm trying to get it done quick so its just a moving white blob behind it.
In Photoshop, before importing to AE, I duplicated the rat animation group and put a stroke on it. This isn't ideal as it is expanded outside the rat, giving it a stroke effect - but it does cover the body of the rat and therefore block out everything behind it. I could live with the stroke effect, it actually looks kind of okay, but I dont know how to apply the group style to its containing layers - and when I import this into AE, AE doesnt recognise the style on the group.
I really dont know what to do - I need some way of being able to sketch over an animal in a video, or an object, and having it have a white opaque background frame by frame.
In photoshop you can ctrl+click a layer, and i does the marching ants around the layer contents. If I could do that for all 205 layers, and fill with white, that'd solve my problem.
Anyway, any advice please, I'm so new to animating in photoshop and I dont know how to solve this problem.