QMS Magicolor WX User Manual page 77

Notes Setting the pixel diameter adjusts the prints density. Pixel
diameters can be measured either in inches or as relative
percentages. You can also specify that the halftone driver
should use a pixel size based on the print resolution. The
mode value or name appears to the left of the scroll bar and
changes as you scroll.
In the inch mode, you adjust the pixel diameter based on the
real pixel size. The displayed size is shown in fractions of an
inch. For example, 1/100 equals 0.01".
In relative-percentage mode, you adjust the pixel diameter
based on final printing resolution. The relative pixel size is
shown as a percentage. For example, 200.00% specifies that
the pixel diameter is 200% larger than the printing resolution.
"DEVICE" specifies that the halftone driver should use a pixel
size based on the print resolution.