84 Manipulating Images
For any selection tool, the context toolbar includes combination buttons (New*,
Add, Subtract, and Intersect*) that determine the effect of each new selection
operation. For example, starting with a square selection (created with the New
button), here's what a second partly overlaid square (shown with a solid line)
might produce with each setting:
New*
=
Add
=
Subtract
=
Intersect*
=
*Not available for Smart Selection Brush
For Rectangle and Ellipse Selection tools, the context toolbar additionally lets
you set a Fixed Size or Fixed Aspect, or number of Rows or Columns (Rectangle
Selection Tool only) in advance of creating your selection—great if you have a
clear idea of the selection area required!
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