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 Scotland, the globe in the centre was replaced by a lion. In the 1950s, the BBC began using logos to differentiate their channels from one another. The BBC1 logo at this time was a circular clock with BBC1 in bubble letters below it. In the 1960s, the main BBC logo consisted of slanted boxes with italicised bold lettering. This was introduced soon after the introduction of ITV in 1955. This type of logo would go on captions at the end of productions as well as on cameras and other equipment used by the BBC. They became important when popular BBC