Edit

The Edit Menu is actually a submenu, and is accessed by clicking the button in the upper right corner of the curves window, and moving the cursor over the Edit menu item to bring up the list of Edit related commands. The Edit menu has commands to modify eyedropper samples and curves.

Select All Ctrl-A Selects all the eyedropper sample points. Delete del Deletes all the selected eyedropper sample points. Undo Ctrl-Z Reverses the last curve modification. A second undo after the first will restore the modification, effectively toggling the last change. Reset Curve Removes all control points from the curve that was last changed, and resets the end points to the upper right and lower left corners of the curve. Reset All Curves Performs a reset operation for all the curves for the currently selected color space, RGB, wg-CMYK, or Lab. The curves will still reflect any Shadow, Highlight, and Neutral points, and any other constraint points you may have created. Press the shift key to also delete those as well, creating a set of untouched curves. Pin Grid

Whole Curve (keyboard shortcut ctrl-P) Creates a control point for each visible curve at each grid intersection, maintaining existing curve shape. Only the curve that you clicked on is pinned. Press the shift key to pin all the visible curves.
Upper Right creates control points to pin the upper right portion of all the visible curves. This is especially useful in Lab mode to isolate changes to a particular color range, as described in the examples. In the example to the right, the lower left corner of the curve has been dragged manually to the right.
Lower Left creates control points to pin the lower left portion of all the visible curves.

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