Make Grayscale Image Into Alpha Mask In Photoshop (2024)

These instructions worked for me:

1. Select All and copy the image from the layer you want to use as a grayscale mask.
2. Switch to the channels tab of the layers panel.
3. Add a new channel. Paste your image data in that new channel.
4. Click the button on the bottom of that panel labeled “Load channel as Selection” — you will get a marquee selection of the alpha channel.
5. Switch back to the layers panel, click on the layer you wish to apply a mask to and click the button at the bottom of that panel “Add Layer Mask”.

And then save it as a PNG and you’re good to go. Note that step 5 is a bit confusing as there isn’t such a button, but if you hover at the bottom something similar is right there.