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G-5 Glossary
offset lithography
Printing in which ink is transferred
from printing plates to a rubber
blanket and then from the blanket to
paper.
output profile
The output profile describes the color
characteristics of a printing device. It
consists of both a profile for your
copier/printer and a calibration target
that defines the expected density
response of the copier/printer.
phosphor
Material used in making computer
monitors; phosphors glow and emit
red, green, and blue light when struck
by an electron beam, thus creating an
image.
photographic rendering
A color rendering style that preserves
tonal relationships in images.
Unprintable colors are mapped to
printable colors in a way that retains
differences in lightness, sacrificing
color accuracy as necessary.
pixel
The smallest distinct element of a
raster image. The term is a
combination of the words “picture”
and “element.”
PostScript
A device-independent page descrip-
tion language developed by Adobe,
which is used to print and display pic-
tures and text. PostScript 3 includes
many enhancements to older versions
of PostScript, including improved
image quality and color with
Enhanced Image Technology, faster
performance with Advanced Page Pro-
cessing, and ease of use and setup with
NetWorks System.
PPD (PostScript Printer Description
file)
A file containing information about a
particular PostScript print device’s
capabilities and restrictions. The
information in the PPD is presented
via the printer driver.
prepress proof
A print made from a set of film
separations or other file to simulate
the results of printing. A prepress
proof is the last opportunity to catch
problems before the print job goes to
press.
presentation graphics rendering
A color rendering style that creates
saturated colors but does not match
printed colors precisely to displayed
colors. It is appropriate for bright
saturated colors used in illustrations
and graphs.
process colors
The four ink colors used in printing to
simulate full-spectrum color images:
Cyan, Magenta, Yellow, and blacK
(CMYK).
QuickDraw
Graphics and display technology built
into Mac OS computers. QuickDraw
applications rely on QuickDraw
(rather than the PostScript language)
to send text and pictures to copier/
printers.