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a trichromatic, trichromic
Involving three colours; in photography and human colour vision, the three colours
used to produce any particular colour, namely, blue, green and red. See RGB.
vb trick; to
To delineate with colour.
n tricolour
A flag with three colours such as the French national flag of blue, white and
red and the Italian tricolore of green, white and red dating from July 1797 and
becoming the national flag in November 1947. Whilst the French are specific
about the precise hues of their national flat the Italians are less certain and in
April 2003 by what has been described as a ‘chromatic coup d’état’ the colours
of their tricolore were apparently changed so to consist of a much darker green,
ivory and a dark-reddish brown or ruby. Also an adjective – using or having
three colours. Also ‘tricoloured’.
a tricoloured
Trichroic or having three colours.
n tristimulus
The three reference colours (red, green, and blue) which when used additively
(tristimulus values) can produce any colour.
n tristimulus colorimeter
See colorimeter.
n tritanomaly
A mild form of colour-blindness in which there is a reduced ability to appreciate
the colour blue. See trichromacy.
n tritanopia
A form of colour-blindness where green is confused with blue – and grey is
confused with yellow or violet. Blindness to blue. Caused by the absence of the
appropriate pigment in the cones of the retina. Sufferers are called ‘tritanopes’.
Airline pilots have been alerted by America’s Federal Aviation Administration
to the fact that the infamous blue impotence drug, Viagra, apparently impairs
the ability to distinguish blue from green.