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Grokking The Gimp
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3.2.3 Intersecting

Intersecting two selections means that the resulting selection is, you guessed it, the intersection of the two. Thus, if A is the set of pixels defined by the first selection and B the set for the second, $A\cap B$ is the result of intersecting the two. The intersection is made by pressing the Shift and Control keys together before pressing the left mouse button to begin the new selection. The Control and Shift keys should be released before releasing the mouse button. The result of intersecting an ellipse with the rectangular selection in Figure  3.15(a) is shown in Figure  3.15(d).

It is useful to note that pressing the Shift and Control keys together while the mouse is in the image window has the effect of changing the mouse cursor to an arrow with a $\cap$ sign below it. This indicates that the next selection will be intersected with any selection already existing in the image window.

Grokking The Gimp
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