Cyan, magenta, yellow, and key (black).CMYK color model
From Wikipedia, the free encyclopedia
"CMYK" redirects here. For the Ladytron song, see Witching Hour.
CMYK (short for cyan, magenta, yellow, and key (black),[1] and often referred to as process color or four color) is a subtractive color model, used in color printing, also used to describe the printing process itself. Though it varies by print house, press operator, press manufacturer and press run, ink is typically applied in the order of the abbreviation.
The CMYK model works by partially or entirely masking certain colors on the typically white background (that is, absorbing particular wavelengths of light). Such a model is called subtractive because inks “subtract” brightness from white.
In additive color models such as RGB, white is the “additive” combination of all primary colored lights, while black is the absence of light. In the CMYK model, it is just the opposite: white is the natural color of the paper or other background, while black results from a full combination of colored inks. To save money on ink, and to produce deeper black tones, unsaturated and dark colors are produced by substituting black ink for the combination of cyan, magenta and yellow.
Layers of simulated glass show how semi-transparent layers of color combine on paper into spectrum of CMY colors
This close-up of printed halftone rasters show that magenta on top of yellow appears as orange/red, and cyan on top of yellow appears as green.Halftoning
Main article: Halftone
With CMYK printing, halftoning (also called screening) allows for less than full saturation of the primary colors; tiny dots of each primary color are printed in a pattern small enough that humans perceive a single color. Magenta printed with a 20% halftone, for example, produces a pink color, because the eye perceives the tiny magenta dots and the white paper between the dots as lighter and less saturated than the color of pure magenta ink.
Without halftoning, the three primary process colors could be printed only as solid blocks of color, and therefore could produce only six colors: the three primaries themselves, plus three complementary colors produced by layering two of the primaries—cyan and yellow produce green; cyan and magenta produce.
ไม่มีความคิดเห็น:
แสดงความคิดเห็น