Use a layer as map alpha (mask) for another - how?

Hi, I do not understand how to do this in Photoshop. In After Effects, which I use a lot, it's easy. For example, I have a layer with semi transparent, transparent opaque areas. I can then say AE to use this layer as a map of alpha channel for another layer. But how to do this in Photoshop? I understand how to use a layer mask and draw on the same layer to create spaces treansparent. But I want to use a layer of separante, or even a separate image.

I use Photoshop CS 5.

Ingvar

Get the clipping mask.

Tags: Photoshop

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