This was really bugging me because I remember seeing it in my Photoshop training course but because I only used it once I forgot! What do I do when I forget something. I make a How to article on it so that if I do forget I can always search my website for it. 😉
I plan on writing an article later why you might want to do this but since you are here you most likely already know why one would want to to create a mask from a color channel.
You can hold down the CTRL and clicking on the Color Channel. Go back to the Image and make a mask from the selection.
In depth tutorial
Anyways let’s get down to it:
- Open Photoshop and the photo you want work on.
- You want to make sure layers is visible. If you don’t see it in the sidebar hit “F7”.
- Make sure you only have one layer.
- Make a copy of that layer by hitting “ctrl+J”.
- In the layer you just made click the channels tab. Currently you should be on the layers tab.
- You will most likely see 4 channels. RGB, Red, Green and Blue. Each Channel can be selected by the displayed shortcut. For example red is: “Ctrl+3”
- You will notice the picture turn to grey scale.
- Holding down the “Ctrl” key click on the Red Channel. This will make a selection of ONLY the red channel.
- You will need to go back to the Layers Tab from the current Channel tab. Click it now.
- At the bottom of the layers box there are a few different Icons. There is a “link” then “FX” and then a “Circle in a box” icon. This is the “add layer mask” button. Click it.
- You picture will no longer be grey. You should now have a mask that looked identical to the grey scale image.