You can use the Magic Wand to select an area of color in a painting. You can then delete, move, or copy the selection.
Click the Selection tool on the tool palette.
You will see the Selection tool options.
Click the Magic Wand.
Click the color you want to select.
You will see the Selection tool options.
Click the Magic Wand.
Click the color you want to select.
Now you delete, move, or copy the selection.
This is a helpful way to remove a solid background from an image on the paint layer.