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Digital Terminology
Channel
The image’s color component. On a “Curve/histogram” screen, there are
four channels, “RGB”, “R-ch (red)”, “G-ch (green)”, “B-ch (blue)”, and the
component distribution in each channel can be adjusted.
CMS
Abbreviation for “Color Management System”. Refer to “Color management
system”.
CMYK
A method of expressing color. By changing the mix ratio of Cyan (C), Ma-
genta (M), Yellow (Y), and Black (K), all colors can be expressed.
It is a method originally used in color printing.
Theoretically is possible to express every color using only the three primary
colors, CMY, however black is added to the three primary colors in order to
facilitate clean printing of the color black.
CMY are complimentary colors to RGB, and CMY is known as a subtractive
color mixture method, as opposed to RGB, which is known as an additive
color mixture method.
Color management system
A system for correcting any discrepancy in the color space depending on the
output device and ensuring the same color is reproduced for the same data.
Typical examples are Macintosh’s “ColorSync” and Windows’ “ICM”.
Color space
This refers to the area where color can be displayed. Color space varies
depending on the output device. To match the colors from input through to
output it is necessary to correct and manage the different color spaces of
each device and then match the colors reproduced (color management).
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