Xerox CX250 User Manual

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. 

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.

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.

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.

Amplitude Modulation 

Halftone screening, as opposed to FM screening, has dots of variable 
size with equal spacing between dot centers.

Glossary