Color Gamuts (Photoshop); Adjusting The Monitor Display - Adobe PHOTOSHOP 6.0 Manual

CHAPTER 3
114
Working with Color
• Converting an RGB image to multichannel
creates cyan, magenta, and yellow spot channels.
• Deleting a channel from an RGB, CMYK,
or Lab image automatically converts the image to
Multichannel mode. (See "About color channels"
on page 116 for more information on channels.)
• To export a multichannel image, save it in
Photoshop DCS 2.0 format.

Color gamuts (Photoshop)

A gamut is the range of colors that a color system
can display or print. The spectrum of colors seen
by the human eye is wider than the gamut available
in any color model.
Among the color models used in Photoshop,
L*a*b has the largest gamut, encompassing all
colors in the RGB and CMYK gamuts. Typically,
the RGB gamut contains the subset of these colors
that can be viewed on a computer or television
monitor (which emits red, green, and blue light).
Therefore, some colors, such as pure cyan or pure
yellow, can't be displayed accurately on a monitor.
The CMYK gamut is smaller, consisting only of
colors that can be printed using process-color
inks. When colors that cannot be printed are
displayed on-screen, they are referred to as out-of-
gamut colors—that is, outside the CMYK gamut.
For more information, see "Identifying
out-of-gamut colors (Photoshop)" in
online Help.
A. Lab color gamut B. RGB color gamut
C. CMYK color gamut

Adjusting the monitor display

Although the RGB color model used by computer
monitors is capable of displaying much of the
visible spectrum, the video system sending data to
a given monitor often limits how many colors can
be displayed at once. By understanding how color
data is measured in digital files and on-screen,
you can better adjust color display settings to
offset the limitations of your video system.
For more information, see "Specifying 8-bit
color display (Photoshop)" in online Help.
A
B
C