Selection Tool

This tool is used to select
rectangular areas of an image, and perform deformations on
selected data.
You can select an area of an image by clicking and dragging a
rectangle on the image with the left mouse button. There are also
other methods of creating a selection, such as using selection-draw mode or pasting image
data from the clipboard.
Once you've selected something, you can
rotate and scale it with the Rotate/scale mode button,
or deform it with the Deform mode button. Each
mode will cause the selection to have a rectangular border on it,
with lines going to the center of the selection. At each junction
of these lines, there will be a small "stub" that you
can click and drag with your mouse. You'll know that your mouse
is on top of a stub because the mouse pointer will change to an
up-arrow symbol.
- In Rotate/scale mode, you can click and drag any of the
four stubs on the outside of the image. The rectangle
will then rotate around the center stub, and when you let
go of the mouse, the selection will be rotated. You can't
actually drag the center stub.
- While dragging the stub, you can hold down the Ctrl
key to cause the size of the selection to stay at
the original size of the selection, while you can
rotate the image freely.
- Or, you can hold down the Shift
key to cause the angle of rotation to be
constrained to a multiple of 45°.
- You can also hold both Ctrl and Shift
for their effects to be combined.
- In deform mode, each of the stubs can be moved
independantly of the others. There can be only one center
stub, but the number of outside stubs can be chosen in
the options menu.
Unlike in rotate mode, you can drag the center
stub. In fact, this is the most useful stub.
- If you've rotated or deformed the image and want to start
over or cancel the operation, click Revert.
Warning: You cannot
revert to the original image after changing modes or
tools!