Creo CXP6000 Color Server, Руководство пользователя

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Glossary 487
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 CXP6000 Color Server processes image files in
PDL formats, converting them into a suitable Ready-To-Print format
for direct, high-quality printing.
PICT
A Macintosh file format for bitmaps and vector graphics.
Pixels Contraction of Picture Element. The smallest element of a digital
image.
PostScript® A programming and page description language that has become
industry standard for electronic publishing. It is used to describe the
entire page, including both text graphics and images. PostScript is
completely independent of the printing device. Developed by Adobe
Systems, Inc.™
Prepress
Generic term used to describe the processes involved in preparing
images for printing. Includes the input, edit and output stages.
Printer description files
PPDs (PostScript Printer Definition), and PDFs (Printer Definition
Files). These files are used by the Macintosh applications to prepare
page and documents for specific output devices.
Process colors The four ink colors used to reproduce full color images - cyan,
magenta, yellow and black.