PhotoPerfect Manual
Select Rectangle
The selection rectangle can be scaled by moving the 8 handles using the left mouse button (if fixed aspect ratio is set there are only 4 handles). If you press the left mouse button while the mouse pointer is within the rectangle, you can then move it as a whole. The right mouse button is used to close and execute the function.
The [Tab] key opens a dialog which allows you to set the size and position of the rectangle by entering exact figures.
To show the selected rectangle more clearly, the area outside is darkened.
see also:
Keyboard Assignments for Select Rectangle