Take for example Photoshop: When you use the magic wand you highlight and Object. In the selection menu you can press expand or contract to change the border of the object’s highlight.
What I want to be able to do:
I have a piece of armor. I want to give it a nice “inner trim”, what I mean is: I want to be able to mask a thin border that’s not on the edge of the object (a little more brought in) and deflate it a little so it looks like there is a groove all the way around the armor. Can this be done? or do I have to manually draw a thin line all the way around the border with a mask?
I wish I had a picture of what I mean. I’m just looking for a quicker way to make a masked border, not on the edge, but more contracted in.