Creo CXP6000 Color Server, Руководство пользователя

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490 Spire CXP6000 Color Server User Guide
Spot color An additional separation (fifth, or more) that is used with special inks
to achieve difficult color combinations, such as gold, or chocolate
brown. Spot color is sometimes used by graphic artists to define
special corporate colors, for example, for company logos. On the
CXP6000 Color Server, spot colors are tanslated into CMYK values
using a dictionary, that can be edited to adjust CMYK values.
Step and repeat The procedure of copying the same image by stepping it in position
both horizontally and vertically according to a predetermined layout.
Stochastic screening A method of creating frequency-modulated halftones that depends
on the number of laser dots in a given area rather than the size of the
laser dots in a given area. The dots are randomly placed and very
small. Areas with a higher dot percent have more spots exposed in
that area and those with a low dot percent have fewer spots. Stochastic
screening is used to eliminate moiré and improve picture detail and
sharpness in high-end color printing.
Subtractive color model
A color process in which the red, green and blue components of the
original subject are reproduced as three super-imposed images in the
complementary (subtractive) colors of cyan, magenta and yellow
respectively. See also
CMYK , Process colors , Additive color model .
Three quartertone
Tone area of an image influencing the shadow detail and with density
values between the Midtone and the Dark Point. Typically printed
with a dot area near 75%.
Three quartertone Tone area of an image influencing the shadow detail and with density
values between the Midtone and the Dark Point. Typically printed
with a dot area near 75%.
Tone compression
The reduction of the density range of an original to the density range
achievable in the reproduction.
Tone reproduction curve
A graph showing the density of each point of the original and its
corresponding density on the reproduction.
Trapping
Creating and overlap (spread) or an underlap (choke) between colors
that adjoin each other to hide misregistration during printing.
Trapping is sometimes referred to as spreads and chokes, or fatties
and skinnies.