Editing Color wheel (section)

===Trichromatic model===
Most color wheels are based on three primary colors, three secondary colors, and the six intermediates formed by mixing a primary with a secondary, known as tertiary colors, for a total of 12 main divisions; some add more intermediates, for 24 named colors. They make use of the [[trichromacy|trichromatic model]] of color.

====Subtractive====
[[File:RGV color wheel 1908.png|thumb|A 1908 color wheel with red, green, and violet "plus colors" and magenta, yellow, and cyan blue "minus colors".]]
The typical artists' paint or pigment color wheel includes the blue, red, and yellow [[primary color]]s. The corresponding [[secondary color]]s are green, orange, and violet or purple. The [[tertiary color]]s are green-yellow, yellow-orange, orange-red, red-violet/purple, purple/violet-blue and blue-green.

Non-digital visual artists typically use [[red]], [[yellow]], and [[blue]] primaries ([[RYB color model]]) arranged at three equally spaced points around their color wheel.<ref>{{cite book|title=The Oil Painting Course You've Always Wanted: Guided Lessons for Beginners|author=Kathleen Lochen Staiger|url=https://books.google.com/books?id=B4Q05KmkEdUC&q=color-wheel+artist+red+yellow+blue&pg=PA41|isbn=0-8230-3259-0|year=2006|publisher=Watson–Guptill}}</ref> Printers and others who use modern subtractive color methods and terminology use [[cyan]], [[magenta]], and [[yellow]] as [[subtractive primaries]]. Intermediate and interior points of color wheels and circles represent color mixtures. In a paint or subtractive color wheel, the 'center of gravity' is usually (but not always<ref>{{cite book|title=Color Harmony Pastels: A Guidebook for Creating Great Color Combinations|author=Martha Gill|url=https://books.google.com/books?id=cl6ELZriVe0C&q=color-wheel+scientific+traditional&pg=PA6|publisher=Rockport Publishers|year=2000|isbn=1-56496-720-4}}</ref>) black, representing all colors of light being absorbed.

====Additive====
A color wheel based on [[RGB]] (red, green, blue) additive primaries has cyan, magenta, and yellow secondaries. Alternatively, the same arrangement of colors around a circle can be described as based on cyan, magenta, and yellow subtractive primaries, with red, green, and blue being secondaries. Sometimes a RGV (red, green, violet) triad is used instead. In an additive color circle, the center is white or gray, indicating a mixture of different wavelengths of light (all wavelengths, or two complementary colors, for example).

[[File:Hsv color circle.svg|thumb|A color wheel based on [[HSL and HSV|HSV]], labeled with HTML color keywords.]]
The [[HSL and HSV]] color spaces are simple geometric transformations of the [[RGB color space|RGB]] cube into cylindrical form. The outer top circle of the HSV cylinder – or the outer middle circle of the HSL cylinder – can be thought of as a color wheel. There is no authoritative way of labelling the colors in such a color wheel, but the six colors which fall at the corners of the RGB cube are given names in the [[X11 color names|X11 color list]], and are [[web colors#HTML color names|named keywords in HTML]].<ref>{{cite web|url=http://www.w3.org/TR/REC-html40/types.html#h-6.5|title=Basic HTML data types|publisher=[[W3C]]|work=HTML 4.01 Specification|date=24 December 1999}}</ref>