Manufacturers will sometimes include an additional green or amber ( " CTO " colour correction ) filter to extend the range ( gamut ) of subtractive colour mixing systems,
2.
In 1921, under the pseudonym O . Reg, he wrote " Byepaths of Colour Photography " in which he discusses in technical detail, the history and theory of developments in subtractive colour photography.
3.
Blue + Yellow = White for light, but not for pigments, for pigments it makes green ( see additive colour and subtractive colour for details ) .-- talk ) 12 : 51, 14 February 2010 ( UTC)
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