Working with Selections
The marquee, lasso, and wand
tools are used to select parts of an icon for moving, copying,
or other operations.
If you hold down the option key while dragging a selection, it will leave a copy behind. If you hold down command and option, it will leave a trail (this may have undesired effects in 32-bit icons, so use it wisely). The shift key constrains dragging to horizontal and vertical movement (but you have to hold the key down after pressing the mouse button).
Through the magic of Macintosh Drag and Drop, you can also drag a selection outside of the window, either to another editing window or to another application (like to the Finder, to create a clipping file).
You can also use the shift key with the lasso and marquee tools to add to the selection, and the command key will subtract from the selection. It's fun.
You can also flip and rotate the contents of the selection using the commands in the Edit menu.
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