Adjust ultra fine lines
If you are printing a drawing and want to emphasize the pen width of very fine
lines, select this option to improve the appearance of the lines. However, in some
applications, if this options is selected and you are printing barcodes, the spaces
in the barcode becomes too narrow. De-selecting this option resolves this
problem.
Summary
This option displays a summary of all selected print options for the current job.
125 • Printer settings in Mac OS X