Adobe Photoshop CS3 Keys for selecting and moving objects keyboard shortcuts keys

Shortcut                                                                                         Command
Any marquee tool (except single column and single row) + spacebar-drag	Reposition marquee while selecting*
Any selection tool Shft-drag	Add to a selection in Adobe Photoshop
Any selection tool + Alt-drag	Subtract from a selection
Any selection tool (except Quick Selection tool) + Shft-Alt-drag	Intersect a selection
Shft-drag	Constrain marquee to square or circle (ifno other selections are active)*
Alt-drag	Draw marquee from center (if no other selectionsare active)*
Shft + Alt-drag	Constrain shape and draw marquee from center*
Ctrl (except when Hand, Slice, Path, Shape, or any Pen tool is selected)	Switch to Move tool in Adobe Photoshop
Alt-drag	Switch from Magnetic Lasso tool to Lasso tool
Alt-click	Switch from Magnetic Lasso tool to polygonalLasso tool
Enter/Esc or Ctrl + . (period)	Apply/cancel an operation of the Magnetic Lasso
Move tool + Alt-drag selection*	Move copy of selection
Any selection + Right Arrow, Left Arrow, Up Arrow, or Down Arrow	Move selection area 1 pixel
Move tool + Right Arrow, Left Arrow, Up Arrow, or Down Arrow	Move selection 1 pixel
Ctrl + Right Arrow, Left Arrow, Up Arrow, or Down Arrow	Move layer 1 pixel when nothing selected on layer
Magnetic Lasso tool + [ or ]	Increase/decrease detection width
Crop tool Enter or Esc	Accept cropping or exit cropping in Adobe Photoshop
/ (forward slash)	Toggle crop shield off and on
Ruler tool + Alt-drag end point	Make protractor
Shft-drag guide	Snap guide to ruler ticks (except when View >Snap is unchecked)
Alt-drag guide	Convert between horizontal and vertical guide