colour


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Related to colour: colour TV, Colour codes

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 classic literature ?
Promise me to let this come back to its own beautiful colour," I had said, as I nodded to a little phial labelled "Peroxide of Hydrogen" on her mantelshelf.
But suddenly his colour changed, and he tried to raise himself, crying, "Where's Black Dog?
The commonest utterances of the commonest citizens in the time of the Colour Revolt seem to have been suffused with a richer tinge of word or thought; and to that era we are even now indebted for our finest poetry and for whatever rhythm still remains in the more scientific utterance of these modern days.
You take an eager interest in that gentleman's concerns," said Darcy, in a less tranquil tone, and with a heightened colour.
our summer atones with its mildness for the dreariness and perils of our winter; it has even given me a colour, pale-face as I am--I can feel it burn on my cheek.
And she held up, so that he might see the light through it, a heart-shaped Locket, apparently cut out of a single jewel, of a rich blue colour, with a slender gold chain attached to it.
For a moment Dona Rita's face, with its narrow eyes, its wide brow, and high cheek bones, became very still; then her colour was a little heightened.
The schooners moored to the quay are trim and neat, the little town along the bay is white and urbane, and the flamboyants, scarlet against the blue sky, flaunt their colour like a cry of passion.
She did not look at him, but straight in front of her, and her colour darkened.
It consisted of one large room, as all houses should do, with a floor in which you could dig [for worms] if you wanted to go fishing, and in this floor grew stout mushrooms of a charming colour, which were used as stools.
The window-curtains were of some rare material and the colour of the purple clematis; they swept the floor grandly and suggested a picture of Mary receiving visitors.
One evening he tied two cats together by their hind legs with a string about six feet in length, and threw them from the wall into the midst of that noble, that princely, that royal bed, which contained not only the "Cornelius de Witt," but also the "Beauty of Brabant," milk-white, edged with purple and pink, the "Marble of Rotterdam," colour of flax, blossoms feathered red and flesh colour, the "Wonder of Haarlem," the "Colombin obscur," and the "Columbin clair terni.