24 bit/3 byte image An image can be either RGB or CMY and each of the three colors uses1 byte or 8 bits of data. Since 3 bytes equals 24 bits, these images arealso known as 24 bit images. This system is used for high quality videoimaging 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 RGBpixel and 8 pixels for a mask layer or other future use. Since 4 byteequal 32 bits, these images are also known as 32 bit images. An 8 bitCMYK image is the minimum required for high quality printreproduction.4 color printing Color reproduction method used to create full color output byoverlaying 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 equals28 choices or 256 possibilities.Additive color model Color system in which the picture is composed of the combination ofRed (R), Green (G) and Blue (B) light transmitted by the originalsubject. Effective for monitors and TV's but not for print. Scannersnormally first scan in RGB and it is converted into CMYK forprinting. See also RGB, CMYK, Process colors, Subtractive colormodel.Amplitude Modulation Halftone screening, as opposed to FM screening, has dots of variablesize with equal spacing between dot centers.Anti-Aliasing A step effect in which angled lines or curved edges of elements in anelectronic image look broken or jagged, as a result of producing it ina grid format. Increasing resolution can reduce this effect or using atechnique called anti-aliasing where the edges are softened.Glossary
