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60 Chapter 3: Selecting and Transforming Objects
Adding to a pixel selection
After drawing a selection marquee with any bitmap selection tool, you can add to the
selection with the same tool or another bitmap selection tool.
To add to an existing pixel selection:
1. Select any bitmap selection tool.
2. Hold down Shift and draw additional selection marquees.
3. Repeat steps 1 and 2 with any bitmap selection tool to continue adding to the selection.
Overlapping marquees join to form a contiguous marquee.
Subtracting pixels from a selection
You can subtract pixels from a selection, or punch out parts of a selection, defining pixel areas
inside the original marquee that will no longer be part of the selection.
To subtract pixels from a selection:
■
Hold down Alt (Windows) or Option (Macintosh) and use a bitmap selection tool to
select the pixel area to be punched out.
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 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.
Using thumbnails and modifier keys to modify pixel selections
With a bitmap selected, you can create a pixel selection on that bitmap using the opacity of
any object or mask in the Layers panel. For more information about the Layers panel, see
“Working with layers” on page 204 .