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col·or

(kŭl'ŏr)
1. That aspect of the appearance of objects and light sources that may be specified as to hue, lightness (brightness), and saturation.
2. That portion of the visible (370-760 nm) electromagnetic spectrum specified as to wavelength, luminosity, and purity.
Synonym(s): colour.
[L.]

colour 

An aspect of visual perception, characterized by the attributes of hue, brightness and saturation, and resulting from stimulation of the retina by visible photopic light levels. Note: also spelled color.
achromatic colour A visual sensation resulting from a stimulus having brightness, but devoid of hue or saturation, e.g. white, grey.
colour agnosia See agnosia.
colour blindness 
See colour blindness.
complementary colour One of a pair of colours which, when mixed additively, produce white or grey (that is to say an achromatic sensation). Examples: green is the complementary colour of red-purple and yellow is the complementary colour of blue. See chromaticity diagram.
confusion colour's Colours that are confused by a dichromat. The colours confused by a deuteranope, a protanope and a tritanope are not the same. For example, the deuteranope will confuse reds, greens and greys, whereas the protanope will confuse reds, oranges, blue-greens and greys. See pseudoisochromatic plates.
colour constancy See colour constancy.
colour contrast See colour contrast.
defective colour vision Marked departure of an individual's colour vision aptitude from that of a normal observer. This is indicated by various tests, e.g. anomaloscope, pseudoisochromatic plates, Farnsworth test. The following types of defective colour vision are usually recognized: anomalous trichromatic vision or anomalous trichromatism; dichromatic vision or dichromatism; monochromatic vision or monochromatism (total colour blindness), anomaly of vision in which there is perception of luminance but not of colour. Both anomalous trichromatism and dichromatism occur in three distinct forms called respectively protanomalous vision and protanopia, deuteranomalous vision and deuteranopia, tritanomalous vision and tritanopia.The causes of defective colour vision may be an impairment of a cone pigment or a reduced number of cone cells. The majority of cases of defective colour vision are inherited and thus bilateral. Acquired defects are rare, mostly tritanopic and appear in one eye or are asymmetric, and affect males and females equally. They may be due to glaucoma, retinal or optic nerve disease, drug or chemical toxicity, diabetes, retinitis pigmentosa, etc. Hence it is essential to test colour vision under monocular conditions. The inherited type occurs as a sex-linked disorder in which the defective gene is on the X chromosome. Since men have only one X chromosome while women have two, sex-linked disorders (most being X-linked recessive) affect mainly males who inherit the genetic defect from their mother. Inherited tritanopia and tritanomaly are usually autosomal dominant. For women to show the defect, both of their X chromosomes have to carry the defective gene, a rare occurrence. Defective colour vision occurs in about 8% of the male population and 0.5% of the female population. Syn. daltonism. See achromatopsia; anomaloscope; deuteranomaly; deuteranopia; inheritance; ChromaGen lens; X-Chrom lens; monochromat; visual pigment; protanomaly; protanopia; Kollner's rule; colour vision test; tritanomaly; tritanopia.
colour fringes Coloured edges around images formed by a lens or an optical system which is not corrected for chromatic aberration.
fundamental colour's See primary colours.
colour induction See colour induction.
colour matching Action of making a colour appear the same as a given colour.
metameric colour Spectrally different radiations that produce the same colour under the same viewing conditions. Note: The corresponding property is called metamerism. Syn. metamers (CIE).
colour mixture The production of a colour by mixing two or more lights of different colours (additive colour mixture) or two or more pigments (subtractive colour mixture). See complementary colour; primary colours.
Munsell colour See Munsell colour system.
non-spectral colour Any colour that does not exist as a single wavelength. Example: purple, which is a mixture of blue and red radiations. See purple.
primary colour's Any sets of three colours such as, for example, red, green and blue, which, by additive colour mixture of the stimuli in varying proportions, can produce any colour sensation. Syn. fundamental colours.
spectral colour's The colours produced by the various radiations of the visible spectrum. See light.
colour space See space, colour.
colour stereoscopy 
See chromostereopsis.
surface colour Colour perceived as belonging to a surface of an object which is not self-luminous.
colour temperature The temperature of the surface of an ideal black body which emits radiations of the same chromaticity as that from the source being specified. As the temperature increases, the amount of radiations increases and the source changes colour from red through to white to blue-white. Unit: Kelvin (symbol: K).
colour triangle See chromaticity diagram.
colour vision See colour vision.
colour vision, aetiology of See defective colour vision.
References in periodicals archive ?
However, it may not be a great choice as a main colour scheme of a room because it is known to be the most fatiguing on the eyes among all colours.
In our professional opinion the colour scheme affects the historic character of the listed building and we have urged Ms Webb to apply for listed building consent.
Colour Scheme followed that effort with a win at Yarmouth, picking up well to score by a comfortable length and half and a 5lb rise for that victory does not look to be too harsh.
Painting your walls will make a big difference to how your home looks but if your furniture is outdated or the wrong complementary colour, you new colour scheme will never quite hit the mark.
Fairhurst & Partners, who were also the original bridge designers, Pyeroy will be providing all scaffolding, access and containment systems to repaint the steelwork in a special two tone colour scheme designed to transform the way light passes through the girders.
From the dull grey of overcast days to the bright blue of summer skies your colour scheme will alter.
Surely TWM can adopt a more subtle colour scheme and also one that allows for advertising and protects the street scene?
Bathrooms which follow an all-white colour scheme can often end up looking stark and plain, so incorporating warm burgundies, deep browns and more muted hues of yellow and orange will give your bathroom a warm, luxurious feel.
ZENA SAYS: Eileen's a lot of fun and I like her colour scheme but I think we can do better than her choice of curtains, Linda.
Source specific items for your scheme and arrange to have them safely delivered After an initial consultation and visit to the couple's home, Chris agreed on a bold colour scheme for the rooms Richard and Pam wanted to focus on which included the lounge and the dining room.
Aga: It's a lovely shade of blue to tie in with the kitchen's colour scheme and it gives the whole room a warm glow, quite literally
Black is also a high impact colour and has the effect of grounding a colour scheme ( adding a touch of drama and energising the other colours around it.