Adobe Photoshop CS4 Keys for using the Curves dialog box keyboard shortcuts keys

Shortcut                                                               Command
Cmnd + M	Open the Curves dialog box
+ (plus)	Select next point on the curve
- (minus)	Select the previous point on the curve
Shft-click the points	Select multiple points on the curve
Cmnd + D	Deselect a point
Select a point and press Delete.	To delete a point on the curve
Arrow keys	Move the selected point 1 unit
Shft + Arrow keys	Move the selected point 10 units
Optn-drag black/white point sliders	Display highlights and shadows that will be clipped
Cmnd-click the image	Set a point to the composite curve
Shft + Cmnd-click the image	Set a point to the channel curves
Optn-click the field	Toggle grid size