Creating a marquee from intersecting marquees

You can select pixels in an existing marquee by drawing a marquee that overlaps the original.

To select a pixel area defined by the intersection of two marquees:

1. Hold down Alt+Shift (Windows) or Option+Shift (Macintosh) while creating a new marquee selection that overlaps the original marquee.
2. Release the mouse button.

   Only the pixels in the intersection area of the two marquees are selected.