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I have a layer in Photoshop that I'd like to use as a layer mask, is this at all possible?

It's a black & white layer with some gradients that I would like to apply to another layer that's a solid color, but I can't figure out how to just edit a layer mask to copy and paste the image in.

P.S. I have Adobe CS5

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@ JKirchartz Can you be more specific? 1. How do I copy the layer? Did you mean duplicate it or something else? 3. Where is the mask channel I shoudl paste to? Thanks – user33459 Nov 12 '14 at 10:33
I've updated my answer to be more specific. – JKirchartz Nov 12 '14 at 20:32

3 Answers 3

Layer masks are located under the channels tab.

  1. Copy the contents of your layer by selecting it then pressing Ctrl+A to select all followed by Ctrl+C to copy.

  2. Select the layer that you want to mask and create a new mask by clicking the "add layer mask" icon at the bottom of the layers panel.

  3. Go to channels tab (at the top of the layers panel), and select the mask channel, it should be named <layername> Mask. Make sure the contents of the mask are selected (Ctrl+A), and paste the contents of the original layer into the mask channel Ctrl+V)

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Doesn't work. The objects I copied in step 1 get pasted into the middle of the layer mask, rather than the positions they were copied from. – BlueRaja - Danny Pflughoeft May 17 at 20:50
@BlueRaja-DannyPflughoeft did you Ctrl+A to select all of the contents of the layer you're pasting into? – JKirchartz May 18 at 16:47
Yes. The layer is mostly transparent, with only a few items on the left-side. When you select the entire layer and copy+paste, the pasted items show up in the middle, with a selection around only them. Try it for yourself. – BlueRaja - Danny Pflughoeft May 18 at 16:55

For future reference – everything that they said above is correct, but if you have transparency, you need to tell it to paste in the specific location on the canvas that you copied from. You do that with "paste in place": Edit > Paste Special > Paste in Place, or just Shift-Cmd-V/Shift-Ctrl-V.

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There is another easier (imo) way to do this. Create a new layer mask for the layer you wish to apply the mask to. Click on the mask in the layer panel, then go to image > apply image.

This allows you many options, including adding layers from any open document, controlling opacity, blending modes, channels, etc.

In this case, if you already have your black and white layer ready, just select the layer name from the drop-down, hit OK, and it's done.

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