What is Primary color?
[[File:RYB.png|thumb|right|Primary colors]]'''Primary colors''' (or '''primary colours''' in [[British English|Commonwealth English]]) are sets of [[color]]s that can be mixed to make a useful range of colors. The primary colors are those which cannot be made by mixing other colors in a given color space. For an [[additive color]] model, as in overlapping projected lights or in [[television]] and [[computer screen]]s, the primary colors are [[red]], [[green]]<!-- Note: NOT YELLOW; this is about the RGB additive primaries, not RYB, which comes later -->, and [[blue]]. For a [[subtractive color]] model, as in mixing of [[pigment]]s or [[dye]]s for printing, the CMY(K) set of primaries is often used. In this system the primary colors are [[cyan]], [[magenta]], and [[yellow]].<ref>{{cite book | title = Color and Its Applications | author = Matthew Luckiesh | year = 1915 | publisher = D. Van Nostrand company | pages = 58, 221 | url = https://books.google.com/books?id=0BgCAAAAYAAJ&dq=magenta+cyan+yellow+date:0-1923+printing&pg=RA1-PA221 }}</ref> Other sets include the RYB system of [[red]], [[yellow]], [[blue]], especially used by artists.<ref>{{cite book | title = Color, space, and style: all the details interior designers need to know but can never find | author = Chris Grimley and Mimi Love | publisher = Rockport Publishers | year = 2007 | isbn = 9781592532278 | page = 137 | url = https://books.google.com/books?id=uVxa-_N4LQ4C&q=ryb%20color%20model%20paint&pg=PA137 }}{{Dead link|date=September 2021 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> This color system is very common, and has been taught for a long time. == Basis == Primary colors are not a part of light itself. Instead, they come from the [[eye]]'s [[physiological]] response to light (the way the eye works). For humans, three primary colors are usually used. In other words, human [[color vision]] is [[trichromatic]]. Light is a [[spectrum]] of the [[wavelength]]s that can be seen by the [[human eye]]. It is an infinite-dimensional [[Sti