Xerox 550, 560 manual Trapping, Enable trapping, Overprint, Black overprint

Quality tab in the job parameters window 99

Parameter	Option	Description
Trapping	Enable trapping	Applies trapping to your job.
		Trapping is a solution that solves misregistration between
		color separations in both offset and digital printing.
		Misregistration can occur regardless of a printing device's
		accuracy and results in white lines around objects on top of
		a background (in a knockout) and also between adjacent
		colors.
		Note: If you don't select this option, it does not affect
		trapping incorporated in DTP software—for example, Adobe
		Photoshop. The CX print server trapping should not be
		used with the trapping options included in DTP software. In
		a PostScript file that already contains trapping from the
		originating application, it is not necessary to use CX print
		server trapping.
		Provides the following options:
		● Frame thickness—Enables you to set a value for the
		thickness of the trapping frame. The thicker the frame,
		the less chance that white areas appear between
		images.
		● Protect small text—Does not frame text that is 12
		points or less when the trapping algorithm is applied.
		You can use this option for small or complex images,
		since thicker frames can decrease quality by hiding
		parts of an image.
Overprint	Black overprint	Ensures that black text prints cleanly within a tint or picture
		area. The text appears in a richer, deeper black, with the
		underlying CMY values equal to those of the printed
		background.