The feather command allows you to soften or blur the edges of your selection by a specific number of pixels. You can experiment with it on one of your own images to create a soft vignette effect. The feather command is usually fine when you just need to feather the selection by a few pixels, but in most cases, you need a more visual approach. I'll be showing you a better alternative to the feather command when we discuss Quick Mask Mode very soon. Next up is the Modify submenu which includes the commands Border, Smooth, Expand, and Contract.
Border creates a selection that frames the border of previously selected area.
The border can be any size from 1 to 64 pixels. See the example below where the circular selection was converted to a border selection of 10 pixels. Original Selection Converted to 10 pixel border selection You'll rarely ever use this command, and if you fill the border selection with a color you'll see why. It makes a fuzzy selection. If you wanted to outline a selection with a hard edge, you'd be better off using the Stroke command.