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New to Alpha channels - how do I remove a background masked with channels?

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Paul Johnson
New to Alpha channels - how do I remove a background masked with channels?
on Jul 25, 2011 at 10:00:08 am

Hello all!

I'm working on a project. Our 3D guy has sent us a series of psd images of a police box on a transparent background. However, when I open these psds, the police box is on a black background. He says that's because the transparency is on an alpha channel (please see this screenshot: http://img853.imageshack.us/img853/4531/alphachannelproblem.jpg

However! In all my years of using Photoshop, I've never needed to use alpha channels and so have no idea how to get rid of this black background. Basically, I just need the police box on a transparent or totally white background.

Our 3D guy doesn't use Photoshop. He says that he easily removes the background in Paint Shop pro though (see attached: http://img851.imageshack.us/img851/976/maskchannel.jpg and if Paint shop can do it, Photoshop certainly should be able to.

Can anyone help? I get the feeling this is something really basic with an easy fix that I just don't know about because I never use channels....

Thanks in advance!

Paul J.


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Tomasz Kaye
Re: New to Alpha channels - how do I remove a background masked with channels?
on Aug 7, 2011 at 8:03:38 am

In the channels palette select the alpha channel. Then click the 'load selection' button at the bottom of the palette (a dotted circle). Select the RGB channel again. You may need to invert your selection to select the background (shift+apple+i on a mac, or do it via the Select menu). Press the delete key to remove the selected background.


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