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24 bit/3 byte image An image can be either RGB or CMY and each of the three
colors uses 1 byte or 8 bits of data. Since 3 bytes equals 24
bits, these images are also known as 24 bit images. This
system is used for high quality video imaging and scanning.
For process color printing, a fourth color (black) is added for
optimum effect.
32 bit/4 byte image An image that uses 8 bits each for CMYK pixels, or 8 bits for
each RGB pixel and 8 pixels for a mask layer or other future
use. Since 4 byte equal 32 bits, these images are also known
as 32 bit images. An 8 bit CMYK image is the minimum
required for high quality print reproduction.
4 color printing
Color reproduction method used to create full color output by
overlaying cyan, magenta, yellow and black inks.
8 bit/1 byte image
An image limited to 256 tones of one color or 256 different
colors. Since 1 byte contains 8 bits and each bit has two
choices, 1 byte equals 28 choices or 256 possibilities.
Additive color model Color system in which the picture is composed of the
combination of Red (R), Green (G) and Blue (B) light
transmitted by the original subject. Effective for monitors and
TV's but not for print. Scanners normally first scan in RGB and
it is converted into CMYK for printing. See also
RGB
,
CMYK
,
Process colors
,
Subtractive color model
.
Absolute Colorimetric A rendering intent method similar to Relative Colorimetric
except that it does not make adjustments according to the
white point. In this method, colors that do not fit within the
output color space are rendered at the extremes of the output
color space. Colors that fall inside the output color space are
matched very accurately.
This method is valuable for representing “signature colors“.
Colors that are highly identified with a commercial product
such as the cyan in the Creo logo.
Glossary