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How does simultaneous colour contrast change the way neighbouring colours appear?
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The RYB color model is being illustrated on a color wheel.
Simultaneous colour contrast is a phenomenon where the appearance of a colour is altered by the presence of an adjacent or surrounding colour. This effect occurs because the retina and the nervous system utilize inhibitory processes to manage visual input.123
When a colour is viewed against a background, the surrounding area exerts an inhibitory effect on the central region. This interaction typically induces the complementary hue of the surrounding colour onto the central object. For example:34
- Brightness: A gray patch appears whiter when placed against a black background, but darker when placed against a white background.2
- Hue: If a white light is projected onto a screen illuminated with blue light, the white light appears pale yellow (the complement of blue), while the blue background may appear grayer than it would in isolation.4
- General Tendency: A colour tends to induce its opposite in hue, value, and intensity upon an adjacent colour, while being mutually affected in return.1
These effects are largely attributed to neural inhibition, where the stimulation of one area of the retina reduces the sensitivity of the surrounding area.3