Color triangle Color triangle A colour triangle is an arrangement of colours within a triangle, based on the additive combination of three primary colors at its corners. An additive colour space defined by three primary colors has a chromaticity gamut that is a color triangle, when the amounts of the primaries are constrained to be nonnegative. Before the theory of additive color was proposed by Thomas Young and further developed by James Clerk Maxwell and Hermann von Helmholtz, triangles were also used to organize colors, for example around a system of red, yellow, and blue primary colors. After the development of the
Logo of the BBC Logo of the BBC The BBC logo has been a brand identity for the corporation and its work since the 1950s in a variety of designs. Until the introduction of a logo in 1958, the corporation had relied on its coat of arms for official documentation and correspondence, although this crest rarely appeared onscreen. With the increased role of television for the BBC in the 1960s, particularly after the foundation of ITV, the corporation used its logo to increase viewer familiarity and to standardise their image and content. The logo has since been redesigned a number of times, most recently,