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 ?
From this experiments, we concluded that the best performance was obtained using RGB vector color space when compare to k-means cluster algorithm to segment the skin pixels in the given color images.
The differences were mainly in content of black and yellow portion in given colors. The difference in CMYK values depends on color.
Tye seems to be commited to two principles: (P1) It is normally possible to determine what color a thing has by looking at it; (P2) Whether or not an object has a given color is a matter of fact.
A player wins by surrounding more area than his opponent (area is measured by the number of unoccupied points enclosed by stones of a given color).
You have to visualize which kind of color combination will look great with the given color of your roof.