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Grokking The Gimp
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3.2.4 Using Add, Subtract, and Intersect with the Rectangle and Ellipse Selection Tool Features

As described in Section  3.1.1, the Shift key can be used to create perfectly square or circular selections, and the Control key can be used to perform selections centered at the position of the mouse click. In addition, Section  3.2 describes how the Shift key can be used for adding selections, the Control key for subtracting them, and the Shift and Control keys together for intersecting them.

The question you may be asking, then, is how these features can be used together. How can a perfect square be subtracted from a prior selection or a center-initiated ellipse added to one? The answer is quite simple. The trick is to remember that adding, subtracting, and intersecting selections is signaled by pressing the Shift key, the Control key, or both before clicking to initiate the selection. The sequence for creating a perfectly square or circular selection or for center-initiated selections is by pressing the Shift key, Control key, or both after clicking to initiate the selection. These features can be combined by applying the following steps:

1.
Begin by pressing the appropriate combination of Shift and Control to specify whether the selection is to be added to, subtracted from, or intersected with an already existing selection.
2.
While the keys are pressed, click and drag in the image window to initiate the new selection.
3.
While the left mouse button is pressed, release the Shift and/or Control keys.
4.
Apply the appropriate combination of Shift and Control keys to specify a perfectly square, circular, and/or center-initiated selection.
5.
While keeping the last combination of Shift and Control keys pressed, release the mouse button, thus completing the selection.

Grokking The Gimp
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