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 in colour, it introduced the 'mirror globe' logo. This logo show a rotating blue globe superimposed over a flat globe, as on a map. Below the globes there is a line and the words BBC1 COLOUR. The word 'colour' was included to remind viewers still watching in black and white to purchase a colour TV set. In 1971, a new softer logo was made, rounding off the boxes and making the spaces between the boxes larger. This logo was used on BBC merchandise, as well as the BBC1 idents and the BBC2 clock. More now than ever, merchandise was being