Editing Purple (section)

=== Relationship with violet ===
[[File:Line_of_purples.png|thumb|This [[CIE chromaticity diagram]] highlights the [[line of purples]] at its base, running from the violet corner near the left to the red corner at the right.]]
Purple is closely associated with [[Violet (color)|violet]]. In common usage, both refer to a variety of colors between blue and red in [[hue]].<ref name="Computational evidence of first ext3">{{cite journal |last1=Tager |first1=A. |last2=Kirchner |first2=E. |last3=Fedorovskaya |first3=E. |date=2021 |title=Computational evidence of first extensive usage of violet in the 1860s |journal=Color Research & Application |volume=46 |issue=5 |pages=961–977 |doi=10.1002/col.22638 |s2cid=233671776}}</ref><ref name="Color - the secret influence2">{{cite book |last1=Fehrman |first1=K.R. |title=Color - the secret influence |last2=Fehrman |first2=C. |date=2004 |publisher=Pearson Education |location=Upper Saddle River}}</ref><ref name=":33">{{cite journal |last1=Matschi |first1=M. |date=2005 |title=Color terms in English: Onomasiological and Semasiological aspects |journal=Onomasiology Online |volume=5 |pages=56–139}}</ref> Historically, purple has tended to be used for redder hues and violet for bluer hues.<ref name="Computational evidence of first ext3" /><ref name=":04">{{Cite web |title=violet, n.1 |url=https://www.oed.com/view/Entry/223648 |access-date=2020-04-06 |website=OED Online |publisher=Oxford University Press}}</ref><ref name=":14">{{Cite web |title=Violet |url=https://unabridged.merriam-webster.com/unabridged/violet |access-date=2020-04-06 |website=Webster's Third New International Dictionary, Unabridged}}</ref> In [[optics]], violet is a [[spectral color]]; it refers to the color of any different single wavelength of light on the short wavelength end of the visible spectrum, between approximately 380 and 450 nanometers,<ref name=":222">{{cite web |author=Georgia State University Department of Physics and Astronomy |title=Spectral Colors |url=http://hyperphysics.phy-astr.gsu.edu/hbase/vision/specol.html |access-date=20 October 2017 |website=HyperPhysics site}}</ref> whereas purple is the color of various combinations of red, blue, and violet light,<ref name="gilbert222">{{cite book |author=P. U.P. A Gilbert and Willy Haeberli |url=https://books.google.com/books?id=qSRqXvZ67lQC&pg=PA112 |title=Physics in the Arts |publisher=Academic Press |year=2008 |isbn=978-0-12-374150-9 |page=112}}</ref><ref name=":33" /> some of which humans perceive as similar to violet.

On a [[chromaticity diagram]], the straight line connecting the extreme spectral colors (red and violet) is known as the [[line of purples]] (or 'purple boundary'); it represents one limit of human [[Color vision|color perception]]. The color magenta used in the [[CMYK]] printing process is near the center of the line of purples, but most people associate the term "purple" with a somewhat bluer tone, such as is displayed by the color "electric purple" (a color also directly on the line of purples), shown below.

On the [[CIE 1931 color space|CIE xy chromaticity diagram]], violet is on the curved edge in the lower left, while purples are on the straight line connecting the extreme colors red and violet; this line is known as the [[line of purples]], or the purple line.<ref>{{cite book|title = Digital video and HDTV|author = Charles A. Poynton|publisher = Morgan Kaufmann|year = 2003|isbn = 1-55860-792-7|url = https://books.google.com/books?id=ra1lcAwgvq4C&pg=RA1-PA221}}</ref><ref>{{cite book|title = Handbook of Optoelectronics|author = John Dakin and Robert G. W. Brown|publisher = CRC Press|year = 2006|isbn = 0-7503-0646-7|url = https://books.google.com/books?id=fY98hmhWp58C&pg=PA381}}</ref>
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<gallery mode="packed" heights="200px">
File:RGB illumination.jpg|On a computer or television screen, purple colors are created by mixing red and blue light. This is called the [[RGB color model]].
File:CIExy1931.png|The [[CIE 1931 color space|CIE xy chromaticity diagram]]
</gallery>