Need After Effects help

# 1 02-10-2010 , 10:24 PM

Acid44

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Hey, I just got After Effects and need help with something.

I've imported my desktop image and want to make it into a Dreamscene Background. I've set up the effect I want to use and set the keyframes and all that, but I want to change the Affected area so that the effect only changes what's going on inside the blob and preserves the biohazard symbols. (See images below.) Is there any way to do this or am I out of luck?

Click to enlarge.

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# 2 02-10-2010 , 10:52 PM

The thin red line
Join Date: Aug 2009

Location: England

Posts: 4,472

I think you can mask the area in after effects, That will not help you if the area is moving.............dave

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Last edited by daverave; 02-10-2010 at 10:55 PM.

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# 3 02-10-2010 , 11:02 PM

Acid44

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The area will be moving, wiggling about and such. I tried a mask, but after I set the mask where I wanted it to be, I couldn't figure out how to show the whole comp again... (See image)

EDIT: Figured out how to show it, now how do I make it so that the mask controls the effect coverage? Cause right now the mask is doing nothing.

EDIT: Figured it all out:

First duplicate the layer you are going to be applying the effect to (Control+D).

Next set up a mask on the layer on topmost layer, make sure that the box beside the word "Mask" is set to "Add".

Then set up your effect.

I think that's it... See screenshot.

user added image

Last edited by Acid44; 02-10-2010 at 11:54 PM.

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# 4 07-10-2010 , 07:55 PM

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Join Date: Jul 2008

Location: Chelmsford, Essex, UK

Posts: 1,162

Not that you still need help, but have been trying to learn after effects too, and I think it would also be possible to 'pre-comp' this, and then bring that composition back into the main comp with your static/unaffected stuff.

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