colour

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colour

(US), color
1. 
a. an attribute of things that results from the light they reflect, transmit, or emit in so far as this light causes a visual sensation that depends on its wavelengths
b. the aspect of visual perception by which an observer recognizes this attribute
c. the quality of the light producing this aspect of visual perception
d. (as modifier): colour vision
2. 
a. a colour, such as red or green, that possesses hue, as opposed to achromatic colours such as white or black
b. (as modifier): a colour television
3. 
a. the skin complexion of a person, esp as determined by his race
b. (as modifier): colour prejudice
4. the use of all the hues in painting as distinct from composition, form, and light and shade
5. the distinctive tone of a musical sound; timbre
6. Physics one of three characteristics of quarks, designated red, blue, or green, but having no relationship with the physical sensation

color (perceived)

That attribute of visual perception that can be described by names such as yellow, red, blue, etc., or some combination of such names. (of an object) A characteristic of the appearance of an object, surface, etc., distinct from its form, gloss, shape, size, or position; depends on the spectral composition of the incident light, on the spectral reflectance or transmittance of the object, and on the spectral response of the observer.

colour

(graphics)
(US "color") Colours are usually represented as RGB triples in a digital image because this corresponds most closely to the electronic signals needed to drive a CRT. Several equivalent systems ("colour models") exist, e.g. HSB. A colour image may be stored as three separate images, one for each of red, green, and blue, or each pixel may encode the colour using separate bit-fields for each colour component, or each pixel may store a logical colour number which is looked up in a hardware colour palette to find the colour to display.

Printers may use the CMYK or Pantone representations of colours as well as RGB.
References in periodicals archive ?
Leons Buck, who was withdrawn off-colour from the recent Swindon leg, is eligible for finals days as he had been nominated to run on the final card that day.
Whereas his dominant boot has often been needed to kick the Wizards to victory, there was no such reliance this time as the home side totally dominated an off-colour Keys outfit.
JESSIE WALLACE may have been feeling a shade off-colour yesterday.
Bodedern floored off-colour Prestatyn 4-0, Gareth Roberts (2), with Craig Brody and Gary Boulton on target.
Wigan's strikers were off-colour although Ellington went close with three second-half efforts, and Liddell hit a post just before the final whistle.
Monleek Dream, who replaces off-colour Black Flame in heat three, is 20-1.
YOU might be forgiven for thinking this chap was a little off-colour.
The Latino lovely appears in an episode to be shown in the States this week and Megan admitted: 'I have to say and I'm not sure if this is a little off-colour but her butt is rivetting.
The North Wales strugglers turned in a dominant first-half display against an off-colour Newtown.
An off-colour Giggs and his fellow United front-men came in for a post-match roasting from Ferguson, who tipped Arsenal as "strong favourites" for the Premiership crown after the champion's eighth League defeat of the season.
MEADOW BANK OWL, an exciting prospect for the six-bend division, has been reported off-colour and will miss the williamhill.com St Leger over 687m at Wimbledon later this month, writes Patrick Kelly.
MATTHEW Watkins scored two of Llanelli's five tries but the Scarlets still looked off-colour.