Graphics Programs Reference
In-Depth Information
RGB Color
The most common mode for graphics in Photo-
shop is RGB. The RGB Color mode uses additive
color theory to represent color (a 100% value of
red, green, and blue light creates white light).
Different intensity values of red (R), green (G),
and blue (B) combine to form accurate colors. By
mixing intensity values, virtually every color can
be accurately represented.
When working in Photoshop, most designers
choose RGB Color mode for its wider range
of available color (also known as
gamut
) and
extensive support for filters and adjustments.
Additionally, computer monitors use RGB mode
to display color, and this is the native color space
for onscreen display. Because you'll most often
be processing images on a computer, it is easiest
to work in the same color space as your monitor.
CMYK Color
Professional printing uses a four-color process
to simulate color. The four inks are cyan (C),
magenta (M), yellow (Y), and black (K, for
key
).
The CMYK Color mode uses the subtractive
color model to re-create color. Subtractive color
explains the theory of how ink or dye absorbs
specific wavelengths of light and reflects others.
The object's color is based on which part of the
light spectrum is not absorbed. Although print
designers use CMYK Color mode for profes-
sional printing, they will work in RGB mode
throughout the design stage. CMYK Color mode
has a smaller color gamut, so CMYK conversion
is saved until the last stage of image preparation.
