Editing Cyan (section)

==On the web and in printing==

===Web colors cyan and aqua===
{{Infobox color
|title=Cyan (additive secondary)
|hex=00FFFF
|source=[[List of HTML color names|X11]]
|isccname=Brilliant bluish green}}

The [[web color]] cyan shown at right is a [[secondary color]] in the [[RGB color model]], which uses combinations of red, green and blue light to create all the colors on computer and television displays. In [[X11 color names|X11 colors]], this color is called both cyan and [[aqua (color)|aqua]]. In the HTML color list, this same color is called aqua.

The web colors are more vivid than the cyan used in the [[CMYK]] color system, and the web colors cannot be accurately reproduced on a printed page. To reproduce the web color cyan in inks, it is necessary to add some white ink to the printer's cyan below, so when it is reproduced in printing, it is not a primary subtractive color. It is called ''aqua'' (a name in use since 1598) because it is a color commonly associated with [[water]], such as the appearance of the water at a tropical beach.<ref>Maerz and Paul ''The Dictionary of Color'' 1930 (see under Aqua in Index, page 189)</ref>

===Process cyan===
{{Infobox color
|title=Cyan (subtractive primary)
|hex=00B7EB
|source=<!-- tintbook does not tell me any of this: --> CMYK<ref>{{cite web|url=http://www.tintbook.com/|title=tintbook.com|access-date=30 September 2014|archive-url=https://web.archive.org/web/20070310213952/http://www.tintbook.com/|archive-date=10 March 2007|url-status=dead|df=dmy-all}}</ref>{{unreliable source?|date = November 2017}}
|isccname=Brilliant greenish blue}}

Cyan is also one of the common inks used in [[four-color printing]], along with [[magenta]], [[yellow]], and [[black]]; this set of colors is referred to as CMYK. In printing, the cyan ink is sometimes known as printer's cyan, process cyan, or process blue.

While both the additive secondary and the subtractive primary are called ''cyan'', they can be substantially different from one another. Cyan printing ink is typically more saturated than the RGB secondary cyan, depending on what [[RGB color space]] and ink are considered. That is, process cyan is usually outside the RGB [[gamut]],<ref>{{cite book |author1=P.U.P.A. Gilbert |author2=Willy Haeberli |title=Physics in the Arts |date=2011 |publisher=Academic Press |isbn=9780123918895 |page=110 |edition=Revised |url=https://books.google.com/books?id=bobHqrTny4QC&pg=PA110 |access-date=31 July 2019}}</ref> and there is no fixed conversion from CMYK primaries to RGB. Different formulations are used for printer's ink, so there can be variations in the printed color that is pure cyan ink. This is because real-world subtractive (unlike additive) color mixing does not consistently produce the same result when mixing apparently identical colors, since the specific frequencies filtered out to produce that color affect how it interacts with other colors. [[Phthalocyanine Blue BN|Phthalocyanine blue]] is one such commonly used pigment. A typical formulation of ''process cyan'' is shown in the color box on the right.