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tints and shades : ウィキペディア英語版
tints and shades


In color theory, a tint is the mixture of a color with white, which increases lightness, and a shade is the mixture of a color with black, which reduces lightness. A tone is produced either by the mixture of a color with gray, or by both tinting and shading.〔Color Theory: An Essential Guide to Color-from Basic Principles to Practical Applications by Patti Mollica, page 17, ISBN 1600583024, 9781600583025〕 Mixing a color with any neutral color (including black, gray and white) reduces the chroma, or colorfulness, while the hue remains unchanged.
In common language, the term "shade" can be generalized to furthermore encompass any varieties of a particular color, whether technically they are shades, tints, tones, or slightly different hues;〔http://www.merriam-webster.com/dictionary/shade〕 while the term "tint" can be generalized to refer to the any lighter or darker variation of a color (e.g. Tinted windows).〔http://www.merriam-webster.com/dictionary/tint〕
When mixing colored light (additive color models), the achromatic mixture of spectrally balanced red, green and blue (RGB) is always white, not gray or black. When we mix colorants, such as the pigments in paint mixtures, a color is produced which is always darker and lower in chroma, or saturation, than the parent colors. This moves the mixed color toward a neutral color—a gray or near-black. Lights are made brighter or dimmer by adjusting their brightness, or energy level; in painting, lightness is adjusted through mixture with white, black or a color's complement.
It is common among some artistic painters to darken a paint color by adding black paint—producing colors called ''shades''—or to lighten a color by adding white—producing colors called ''tints''. However, this is not always the best way for representational painting, since an unfortunate result is for colors to also shift in their hues. For instance, darkening a color by adding black can cause colors such as yellows, reds and oranges, to shift toward the greenish or bluish part of the spectrum. Lightening a color by adding white can cause a shift towards blue when mixed with reds and oranges. Another practice when darkening a color is to use its opposite, or complementary, color (e.g. violet-purple added to yellowish-green) in order to neutralize it without a shift in hue, and darken it if the additive color is darker than the parent color. When lightening a color this hue shift can be corrected with the addition of a small amount of an adjacent color to bring the hue of the mixture back in line with the parent color (e.g. adding a small amount of orange to a mixture of red and white will correct the tendency of this mixture to shift slightly towards the blue end of the spectrum).

== References ==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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