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Pre-multiplied,Matted Alpha Channel

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Firtich
Pre-multiplied,Matted Alpha Channel
on Feb 16, 2006 at 8:06:51 pm

Hi, I am an After Effects user, when you render a file in after effects you get an option to pre-multiply or not your alpha channel. Photoshop does not give you this option, Here is a visual example of what I'm talking about, Here is Photoshop version
Here is the pre-multiplied After Effect Version
My question is how do you premultiply or matte the alpha channel in Photoshop
Thanks in advance



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Richard Harrington
Re: Pre-multiplied,Matted Alpha Channel
on Feb 17, 2006 at 12:19:05 am

Can't do it automatically


Two real options

If Photo.. create tranparenct with layer mask.... then disable layer mask and let alpha channel cut hole

if graphic... fill color of glow or shadow in as a solid background layer after creating the channel

Richard M. Harrington, PMP

Author: Photoshop CS for Nonlinear Editors
Co-Author Final Cut Pro on the Spot, After Effects on the Spot, Broadcast Graphics on the Spot, and After Effects @ Work
Check out the new DVD: Photoshop CS: Essentials for Digital Video from http://www.photoshopforvideo.com

edit - produce - direct -


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Firtich
Re: Pre-multiplied,Matted Alpha Channel
on Feb 17, 2006 at 12:40:16 am

Works like Charm
Thanks



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Richard Harrington
Re: Pre-multiplied,Matted Alpha Channel
on Feb 17, 2006 at 2:44:02 am

Good....

Check out PS NLE book or photoshopforvideo.com for videos on this and more

Richard M. Harrington, PMP

Author: Photoshop CS for Nonlinear Editors
Co-Author Final Cut Pro on the Spot, After Effects on the Spot, Broadcast Graphics on the Spot, and After Effects @ Work
Check out the new DVD: Photoshop CS: Essentials for Digital Video from http://www.photoshopforvideo.com

edit - produce - direct -


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