Instead of chosing from a list with fixed entries, you can define any resolution in a list here. When you have chosen an entry, its values are shown in the edit fields below the list. There you can directly change these values. The horizontal (left value) and vertical (right value) resolutions may differ!
The Three Arrows
move the currently selected entry within
the list. With New
and Delete
you can create new entries
or remove old ones. The TIFF output always uses the currently selected
value from the list.