Xerox CX250, CX240 manual Compensate for this possibility. On Continous Tone images, To Creo APR

Glossary	255
Misregistration	A situation common during printing where one or more of the color
	separations is slightly misaligned with regard to the others on press.
	Misregistration shows up as white gaps or tinted overlaps at the
	borders of color pairs. Colors containing such files are trapped to
	compensate for this possibility. On Continous Tone images,
	misregistration can lead to blurring. See also Overprint and Trapping.
Moiré	An interference pattern caused by differences in halftone screen
	angles or rulings. In process color printing, screen angles are selected
	to minimize this pattern. If the angles are not correct, a pattern that
	distracts the eye from the picture may be produced.
Newton's rings	Small concentric circles that can appear on film when two surfaces are
	closed together but not in perfect contact.
OPI	Abbreviation of Open Prepress Interface. A prepress convention
	established by Aldus Corps. OPI refers to tags or place holders in
	source PostScript that point to TIFF or EPS images that have not been
	embedded in the PostScript. These images reside in other locations
	and are merged with the PostScript file when processed. Normally
	used for performing high res/low res image substitution (alternative
	to Creo APR).
Output resolution	The number of laser dots per unit of linear measurement (millimeter,
	inch etc.) on film or paper.
Output tone curve	A graph showing the relationship of original input densities and the
	corresponding dot percentages on film.
Overprint	A technique, which overlaps colored elements to eliminate the
	appearance of gaps between elements caused by misregistration of the
	various separations during printing. For example, black text is
	normally set to overprint. See also Trapping and Misregistration.
PDL	Printer Description Language files (for example, PostScript, PDF,
	EPS, VPS, VIPP). The CXP Color Server processes image files in PDL
	formats, converting them into a suitable Ready-To-Print format for
	direct, high-quality printing.