: How do I make a greyscale layer become a mask for another layer in Photoshop CS6? I wanted to create a mask that looked exactly like another layer that I have. How do I do that?

@Deb5748823

First of all copy your layer to the clipboard (it will be your mask)
Add a layer mask on the layer where mask must be aplied
Open Channels palette and select your mask channel. Make it visible ("eye" mark)
Paste from clipboard the previously copied image.


In CS4 it was a bit easier :)

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@Cofer715

Go to the Channels palette. Hold Ctrl/Option and click on the RGB thumb. Now you have a selection that you can apply as a mask to any of your layers.

If you want just one layer, single it out by holding Ctrl/Option + Alt and clicking the eye icon of that layer, then the same ...

Channels, Ctrl/Option+click, make mask.

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