After you draw a marquee to select pixels, you can expand or contract its border.

To expand the border of a marquee:

  1. After drawing the marquee, select Select > Expand Marquee.
  2. Enter the number of pixels by which you want to expand the border of the marquee, and click OK.

To contract the border of a marquee:

  1. After drawing the marquee, select Select > Contract Marquee.
  2. Enter the number of pixels by which you want to contract the border of the marquee, and click OK.