How do I use a channel as a layer mask in Photoshop?

Asked 3/11/2012

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Can Photoshop use an existing channel—such as the Red channel or a Lab luminosity channel—as a mask for a layer? If so, what are the steps to copy that channel into a layer mask?

photoshop post-processing retouching layer-masks channels

Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0

Photography Stack Exchange contributor

14y ago

2 Answers

Yes, two ways I know of:

Go to the channels palette.
Select the channel you want.
Ctrl-click (Cmd-Click on a Mac), to copy the channel.
Then go back to your layer and add your mask

create a blank, white mask on your layer
make sure the mask is selected
go to Image > Apply Image
select the channel you want from the channel dropdown
click ok

I use a red mask when doing skin softening, because skin will show up light in the red channel. I describe this in my answer to this question: What is the best techinque to smooth skin?

Originally by user4191. Source · Licensed CC BY-SA 4.0

user4191

14y ago

AI Answer

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Yes. In Photoshop you can use a channel as a layer mask in two common ways:

In the Channels panel, choose the channel you want.
Ctrl-click the channel thumbnail (Cmd-click on Mac) to load it.
Return to the target layer and add a layer mask.

Or:

Add a blank white mask to the layer.
Click the mask so it is active.
Go to Image > Apply Image.
Choose the source channel you want from the channel menu and apply it.

This is useful when a channel already separates tones well. For example, the Red channel is often used for skin work because skin usually appears lighter there, making it a helpful starting point for selective softening or retouching.

How do I use a channel as a layer mask in Photoshop?

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