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The normal explanation of trichromacy is that the organism's retina contains three types In actuality the number of such receptor types may be greater than three, since different. — “Trichromacy - Wikipedia, the free encyclopedia”, en.wikipedia.org
I, however, will of course contend that subjective colour does exist but is experienced in a trichromic way. Even more troubling is the fact that the colourfoci do not simply coincide with either the trichromic or tetrachromic system: e.g. the focus for yellow is more orange than primary or unary. — “Talk:Natural Color System - Wikipedia, the free encyclopedia”, en.wikipedia.org
He is the designer of the submarine periscope, and worked at the adjustment of trichromic process of colour photography. He patented the "Cinématographe", which serves as a film projector and developer in the late 1890s, and built devices from the Lumière Brothers. — “Jules Carpentier - Wikipedia, the free encyclopedia”, en.wikipedia.org