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(Redirected from CMYK)

Cyan, magenta, yellow, and key (black).

Layers of simulated glass show how semi-transparent layers of color combine on paper into spectrum of CMY colors.
"CMYK" redirects here. For the Ladytron song, see Witching Hour.
CMYK (short for cyan, magenta, yellow, and key (black), 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 ubtract brightness from white.
In additive color models such as RGB, white is the dditive 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.
Contents
1 Halftoning
1.1 Screen angle
2 Why black ink is used
3 Other printer color models
4 Comparison with RGB
5 Conversion
6 See also
7 Notes and references
8 External links
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Halftoning

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.
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 human beings 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 primariesyan and yellow produce green; cyan and magenta produce a purplish blue; yellow and magenta produce red (these subtractive complementary colors correspond roughly to the additive primary colors). With halftoning, a full continuous range of colors can be produced.
Screen angle

A color photograph of the Grand Tetons.

The image above, separated for printing with process cyan, magenta, and yellow inks.
To improve print quality and reduce moir patterns, the screens for individual colors are set at unique angles. While the specific angles depend on how many colors are used and the preference of the press operator, typical CMYK process printing uses any of the following screen angles:
C
75
15
105
M
15
45
75
Y
0
0
90
K
45
75
15
Why black ink is used
The lack generated by mixing cyan, magenta and yellow primaries is unsatisfactory, and so four-color printing uses black ink in addition to the subtractive primaries. Common reasons for using black ink include:
Text is typically printed in black and includes fine detail (such as serifs), so to reproduce text or other finely detailed outlines using three inks without slight blurring would require impractically accurate registration (i.e. all three images would need to be aligned extremely precisely).
A combination of 100% cyan, magenta, and yellow inks soaks the paper with ink, making it slower to dry, and sometimes impractically so.
A combination of 100% cyan, magenta, and yellow inks often results in a muddy dark brown color that does not quite appear black. Adding black ink absorbs more light, and yields much darker blacks.
Using black ink is less expensive than using the corresponding amounts of colored inks.
When a very dark area is desirable, a colored or gray CMY edding is applied first, then a full black layer is applied on top, making a rich, deep black; this is called rich black. A black made with just CMY inks is sometimes called a composite black.
The amount of black to use to replace amounts of the other ink is variable, and the choice depends on the technology, paper and ink in use. Processes called under color removal, under color addition, and gray component replacement are used to decide on the final mix; different CMYK recipes will be used depending on the printing...(and so on)

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