COLOURS AT NIGHT
EFFECT OF BACKGROUND “The clearness with which an object is seen depends very much upon its background. Colour is recognised earlier if there is any illumination, however feeble, in its vicinity. Different colours are more easily seen on different backgrounds. Thus red and yellow are seen earlier on white and green on black. “On a moonless night shadows are virtually absent, so that stereoscopic vision is less efficient, and distances consequently harder to judge. As the eye becomes dark-adapted the apapparent brightness of colour changes. “In daylight yellow is the brightest colour. At night green becomes more 'easily recognised than yellow, blue, and red—in that order. This fact becomes apparent on taking a country walk when the green of the grass becomes the most easily seen colour. In the completely dark-adapted eye vision is achromatic and all colours have the same hue, differing only in intensity.”—The Lancet.
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Bibliographic details
Gisborne Herald, Volume LXVII, Issue 20136, 4 January 1940, Page 8
Word Count
150COLOURS AT NIGHT Gisborne Herald, Volume LXVII, Issue 20136, 4 January 1940, Page 8
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