How do you use masking in Photoshop to create pictures with rounded corners?

Question

I have a picture that is 200x100 and I want to round off the corners. I did it once using the mask command but cannot remember what I did since I was attempting to do it and wasn't sure it was the correct command. Make sense?

Answer 1

You can use the Quick-Mask-Mode for a quick selection.

Just change into the Quick-Mask-Mode and use the Rounded Rectangle (beneath the normal rectangle tool) in its third mode (Fill Pixel; at least in CS2), Black should be foreground colour, then return to Standard Mode, and you have a selection. Now you can delete the corners...