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Is it possible to do an ALPHA MATTE in photoshop?

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DanielHaskett
Is it possible to do an ALPHA MATTE in photoshop?
on May 27, 2005 at 2:40:28 am

hi there

basically i have a black line drawing and a green background, i want the black line drawing on the green background and i know that in after effects you could do this by copying the black line drawing then inverting it then setting it as an alpha matte to the green background. is anytihng like this possible in photoshop?

thanks

dan


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Jeff Cochran
Re: Is it possible to do an ALPHA MATTE in photoshop?
on May 27, 2005 at 2:45:31 am

Yes it is.

Go to the windows pull down menu > Channels.

Copy and paste the line art drawing into a new channel. Now when you save this file that channel will act as an Alpha

Jeff Cochran

http://www.jeffcochrandigitalartist.com/


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DanielHaskett
Re: Is it possible to do an ALPHA MATTE in photoshop?
on May 27, 2005 at 3:26:19 am

Wicked thanks for your help! So its not possible to see the affect it has until you have saved it?

thanks
dan


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Jeff Cochran
Re: Is it possible to do an ALPHA MATTE in photoshop?
on May 27, 2005 at 4:20:03 am

Here's a way to see the effect (Sort of)

Hold down the apple key and click on the channel icon in the channel palette. This will make a selection out of the channel. The marching ants will give you a good idea what will show and what wont. You can also make a layer mask from the selection, that will give you a good idea what it looks like. Otherwise, yeah, you really wont see it until you get it to AE.


Jeff Cochran

http://www.jeffcochrandigitalartist.com/


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Filip Vandueren
Re: Is it possible to do an ALPHA MATTE in photoshop?
on May 31, 2005 at 2:49:26 am

Hi Daniel,

you can also double-click on your background-layer, so it becomes 'layer 1'.
The background layer cannot have transparancy, but layer 1 can.

Now select your Alpha Channel like before, so you have the marching ants.
Then hit the little "add layer mask" button in the layers-palette.
You should have transparancy now. and You can safely delete the fourth channel.

Since After Effects understands PSD files pretty well, it will see this transparancy as an alpha channel even though it is not explixilty a 4th channel.


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