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  2. Color theory - Wikipedia

    en.wikipedia.org/wiki/Color_theory

    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. purplish-red added to yellowish-green) to neutralize it without a shift in hue and darken it if the additive color is darker than the parent color.

  3. Color scheme - Wikipedia

    en.wikipedia.org/wiki/Color_scheme

    A complementary color scheme comprises two colors that combine to form gray, i.e. they are on opposite sides of the color wheel. Fully saturated complementary colors maximize color contrast. A split-complementary (also called compound harmony) color scheme comprises three colors, namely a base color and two colors that are 150 degrees and 210 ...

  4. Theory of Colours - Wikipedia

    en.wikipedia.org/wiki/Theory_of_Colours

    Light spectrum, from Theory of Colours – Goethe observed that colour arises at the edges, and the spectrum occurs where these coloured edges overlap.. Theory of Colours (German: Zur Farbenlehre) is a book by Johann Wolfgang von Goethe about the poet's views on the nature of colours and how they are perceived by humans.

  5. Opponent process - Wikipedia

    en.wikipedia.org/wiki/Opponent_process

    When staring at a bright color for a while (e.g. red), then looking away at a white field, an afterimage is perceived, such that the original color will evoke its complementary color (green, in the case of red input). When complementary colors are combined or mixed, they "cancel each other out" and become neutral (white or gray).

  6. Color term - Wikipedia

    en.wikipedia.org/wiki/Color_term

    A color term (or color name) is a word or phrase that refers to a specific color. The color term may refer to human perception of that color (which is affected by visual context) which is usually defined according to the Munsell color system , or to an underlying physical property (such as a specific wavelength of visible light ).

  7. Color wheel - Wikipedia

    en.wikipedia.org/wiki/Color_wheel

    A color wheel or color circle [1] is an abstract illustrative organization of color hues around a circle, which shows the relationships between primary colors, secondary colors, tertiary colors etc. Some sources use the terms color wheel and color circle interchangeably; [ 2 ] [ 3 ] however, one term or the other may be more prevalent in ...

  8. Blend modes - Wikipedia

    en.wikipedia.org/wiki/Blend_modes

    This is the standard blend mode which uses the top layer alone, [3] without mixing its colors with the layer beneath it: [example needed] (,) =where a is the value of a color channel in the underlying layer, and b is that of the corresponding channel of the upper layer.

  9. Birefringence - Wikipedia

    en.wikipedia.org/wiki/Birefringence

    The opposite colors are seen in calcium pyrophosphate dihydrate crystal deposition disease (pseudogout, right image): blue when parallel and yellow when perpendicular. For instance, needle aspiration of fluid from a gouty joint will reveal negatively birefringent monosodium urate crystals .