by Julieanne Kost
As is common in the many dialog boxes and panels throughout Photoshop, the Tab key moves between numeric entry boxes. For example, tab moves between the Input or Output options in Curves Adjustment panel (although in this case, this is a MAc only shortcut…). Note: one of the text/numeric entree boxes must be active in order to move to another.
In addition, once the box is highlighted, the up/down arrow keys increase/decrease the value by one unit. Add the shift key to shift the value by 10 units.