Add, which adds the kern pair to the table in the edit controls.You can fine-tune character spacing for proportional fonts by using pair-kerning. The Pair Kerning Table dialog box consists of a list box containing character pairs and the amount of space to insert or delete between them. A negative kern amount (given in font units) specifies tighter spacing, while a positive amount spreads characters out.
The three edit controls are for the From and To characters and the kerning amount. If you select a kern pair in the list box, the editor displays the values in the structure for modification.
There are three buttons for manipulating the Pair Kerning Table:
Add, which adds the kern pair to the table in the edit controls.
Delete, which removes the selected kern pair from the list box.
Change, which replaces the selected kern pair with the contents of the edit control.
The Pair Kerning Table is sorted; adding or replacing a pair does not give it a particular position in the table.
As in the other dialog boxes, the OK button carries out the changes in the PFM file, and the Cancel button ends the dialog without saving the changes to the table.