The following shortcuts work with the Curves dialog box:
Ctrl-click (Windows) or Command-click (Mac OS) in the image to set a point on the curve in the current channel specified in the Curves dialog box.
Shift+Ctrl-click (Windows) or Shift+Command-click (Mac OS) in the image to set a point on the curve for the selected color in each color component channel (but not in the composite channel).
Shift-click points on the curve to select multiple points. Selected points appear filled with black.
Click in the grid, or press Ctrl-D (Windows) or Command-D (Mac OS) to deselect all points on the curve.
Press arrow keys to move selected points on the curve.
Press Ctrl+Tab (Windows) or Control+Tab (Mac OS) to move forward through control points on the curve.
Press Shift+Ctrl+Tab (Windows) or Shift+Control+Tab (Mac OS) to move backward through control points on the curve.
