Making round selections in any image can be a frustrating task. Both elliptical and
circular selections can prove inaccurate when created normally.
By using the Alt key, you can make a round selection from its center, instead of using one
of the corners. Select the Elliptical Marquee Tool, by pressing 'M' or selecting it from
the toolbar. Hold Alt down and click the center of the object you wish to select. Drag outwards to
size your selection.
While you're dragging you have some more options. Holding down the Shift key will enforce
a circular selection, instead of just an elliptical one. To move the selection without changing
the image, and before you have accepted the final selection, hold the Space Bar and move
the mouse cursor.
All these techniques can be used in any combination to make all kinds of circular selection easy.
A summary of the main points is given below:
Normal Selection - Elliptical selection is formed as you drag with one of the corners placed
where you clicked.
With ALT Key - Elliptical selection is formed as you drag with the center placed where you
clicked.
With SHIFT Key - Selection is forced to be circular, instead of elliptical.
With SPACE BAR - Selection can be moved while it is still being defined, to position it
exactly where you want it, and ensure the correct selection dimensions are achieved.
Kind Regards
Robert Redwood - Bio
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