
Color Settings
Although Chapter 5 explained how to configure the color settings in the
Color Settings dialog box, you might be a bit confused as to what some of
the terms mean. UCR, GCR, black generation, and similar terms are
detailed more fully here.
Undercolor Removal (UCR)
When creating color separations, RGB is translated into CMYK. In the
-
ory, the new colors (C, M, and Y) are combined to create the black
needed in the image. In reality, however, when mixed together these
colors create a muddy brown instead.
Using UCR, the black ink is used to replace cyan, magenta, and yel-
low only in areas with neutral colors like shadows, grays, and white
highlights. ...