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Glossary 251
CMYK
The process colors - Cyan, Magenta, Yellow and Black. See also Color
separations, Process colors, and Subtractive color model.
Color gamut
The range of colors possible with any color system.
Color separations
Separate films are prepared for each of the process printing inks -
cyan, magenta, yellow and black. These films are used to prepare the
printing plates for printing on press. See also CMYK.
CSA (Color Space Array)
Color Space Array is the spectrum of specific variants of a color
model with a specific gamut or color range. For example, within the
color model RGB, there are numerous color spaces, such as Apple
RGB, sRGB, and Adobe RGB. While each of these define color by the
same three axes (R, G, and B), they differ in gamut and other
specifications. CSA is comprised of a three-dimensional geometric
representation of colors that can be seen or generated using a certain
color model and are quantitatively measured. Source CSA is to be
used only under the assumption that the upstream color workflow
was managed and monitored. Otherwise it should be replaced with a
Creo profile, which is the default.
CSA Profiles
There are three CSA profiles with gammas of 1.8, 2.1 and 2.4. The
higher the gamma, the darker the RGB appears. This workflow should
be used when you have images from different sources, such as digital
cameras, Internet, and scanners and you want the images to have the
common RGB color spaces.
Other possible CSA profiles are sRGB and Adobe RGB
Composite mode
In composite mode, the data required to separate a page into its
CMYK components is all contained within one single (composite)
file. Brisque or PS/M then separates the file into CMYK as part of the
conversion process. This processing mode is the fastest and most
efficient in the majority of cases.
Creep
The effect of middle pages of a folded signature extending slightly
beyond outside pages, compensated by shingling. See also Shingling.
Crop
To eliminate portions of an illustration or photography so the
remainder is more clear, interesting or able to fit the layout.
CT
Abbreviation for continuous tone. Color or black and white
photographic images with tones that change gradually from dark to
light (unlike the abrupt changes in linework).