Editing Color wheel (section)

==Color wheels and paint color mixing==
[[File:020 schiffermueller1.jpg|thumb|Ignaz Schiffermüller, Versuch eines Farbensystems (Vienna, 1772), plate I. Color wheels can be used to create pleasing color schemes.]]
There is no straight-line relationship between colors mixed in pigment, which vary from medium to medium. With a psychophysical color circle, however, the resulting hue of any mixture of two colored light sources can be determined simply by the relative brightness and wavelength of the two lights.<ref name="Schiffman">Schiffman, H.R. (1990) Sensation and perception: An integrated approach (3rd ed.). New York: John Wiley & Sons, pp. 252–253.</ref> A similar calculation cannot be performed with two paints. As such, a painter's color wheel is indicative rather than predictive, being used to compare existing colors rather than calculate exact colors of mixtures. Because of differences relating to the medium, different color wheels can be created according to the type of paint or other medium used, and many artists make their own individual color wheels. These often contain only blocks of color rather than the gradation between tones that is characteristic of the color circle.<ref name="paint">Rodwell, J. (1987) The complete watercolour artist. London: Paul Press, pp. 94–95.</ref>

===Color wheel software===
{{Main|Color picker}}
A number of interactive color wheel applications are available both on the Internet and as desktop applications. These programs are used by artists and designers for picking colors for a design.