I have a layer containing an icon in color. My goal is to have the same icon in black and white as well (i.e., both the color and the black & white version in a single image).
When I select the color image on Layer 1 and duplicate it, then highlight Layer 1 copy, and finally click on the adjustments icon at the bottom of the layers panel to reduce the hue, I get the following result:
Selecting any layer will now yield black and white icons for both icons (even though I want Layer 1 to remain colorful).
(Also, Ctrl-Z does not undo it.)
How can I make Layer 1 copy black and white but leave Layer 1 colorful?