ADOBE AFTER EFFECTS: Forum Expressions Tutorials Creative Cloud

locking alpha channel of a tga file when applying an effect?

COW Forums : Adobe After Effects

<< PREVIOUS   •   FAQ   •   VIEW ALL   •   PRINT   •   NEXT >>
Ed Zenonlocking alpha channel of a tga file when applying an effect?
by on Aug 3, 2010 at 1:17:49 pm

I'm very new to after effects, but have been able to learn quickly due to my experience with photoshop.

one thing I'm stumped on is this. I want to lock the alpha channel of a tga sequence so I can apply a blur within the alpha mask only so the edges dont get blured. I cant find a way of doing this without blurring the entire image.

I then want to apply a subtle blur for the edges on top of that.

please can someone point me in the right direction for this, I'm on a deadline for today :(

cheers


Return to posts index

Dave LaRondeRe: locking alpha channel of a tga file when applying an effect?
by on Aug 3, 2010 at 2:56:50 pm

Duplicate the alpha-channel layer. On the bottom layer, set the blur, and then set the layer to use the upper layer as an track matte: Alpha Matte or Alpha Inverted Matte, depending on what you need.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


Return to posts index

Kevin CampRe: locking alpha channel of a tga file when applying an effect?
by on Aug 3, 2010 at 3:34:53 pm

there's also an effect called channel blur that will let you blur the individual channels of the sequence... so you can blur the r, g and b channels with a setting of say 10, and the alpha with a setting of say 2.

Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW


Return to posts index


Ed ZenonRe: locking alpha channel of a tga file when applying an effect?
by on Aug 3, 2010 at 5:42:56 pm

cheers guys. I stumbled on the blur channels earlier on so just used that.

dave - cool, I think I may have used that technique before, though wouldn't it also apply to all the other layers underneath? would be cool to just link the adjustment layer button to certain file layers.


Return to posts index

Dave LaRondeRe: locking alpha channel of a tga file when applying an effect?
by on Aug 3, 2010 at 8:09:12 pm

[Ed Zenon] "wouldn't it also apply to all the other layers underneath"

Nope: a track matte affects only the layer immediately below it, creating some form of transparency dictated by the kind of track matte setting used in the lower layer.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


Return to posts index

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
© 2017 CreativeCOW.net All Rights Reserved
[TOP]