G-3
Glossary
are mapped exactly to output values.
Most devices have a gamma curve greater
than 1.
gamut
A range of colors. A device gamut is the
range of colors that a device, such as a
printer, can produce. An image gamut is
the range of colors in a particular image.
gamut mapping
The process whereby the color
management software compresses—
“maps”—the colors in a digital image to
fit the color gamut of a particular device.
gradient
A smooth transition between two
different colors or between two shades of
a color.
Graphics Device Interface (GDI)
Graphics and display technology used by
computers running Windows. GDI
applications rely on GDI (rather than
the PostScript language) to send words
and pictures to printers.
gravure
A printing technology that uses an
etched cylinder that has been immersed
in ink. The ink that remains in the
etched areas is applied to the paper. The
raised surfaces of the cylinder are non-
printing areas.
halftoning
A method for representing an original
continuous tone image using a pattern of
dots of various sizes.
metamerism
Phenomenon in which two colors
composed of different combinations of
light wavelengths appear identical. The
colors are called “metamers.”
moiré
An undesirable pattern in images made
using halftone screens. Moiré can be
caused by improper screen angles,
improper alignment of halftone screens,
or by the combination of a halftone
screen with patterns in the image itself.
named color
A color that is defined according to a
custom color system. For example,
PANTONE 107 C is a named color.
office applications
Software applications commonly used
for business purposes, including
presentation applications, spreadsheets,
and word processing programs.
offset lithography
Printing in which ink is transferred from
printing plates to a rubber blanket and
then from the blanket to paper.
phosphors
Materials used in making computer
monitors.
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, slightly
sacrificing color accuracy as necessary.
