![]() The luminance is basically the brightness, while the chrominance is the location in the hue/saturation colour circle. The luminance image is what a black-and-white camera records. A full-colour image (right) can be decomposed into a luminance (brightness) component (left), which has no colour information, and a chrominance (colour) component (centre) which has no brightness information. These three colour coordinates explain how we might describe a colour as a “dark grey green” or a “light rich blue”.įigure 2. “Hue” (H) corresponds closely to what we loosely call colour, “saturation” (S) corresponds to how rich a colour is, and “value” (V) loosely corresponds to the brightness. This could be the red, green, blue intensities (RGB) or the following representation known as HSV. To fully describe a colour, it’s helpful to think of it using three numbers. We can think of them as being “red”, “green” and “blue” sensors, although their sensitivities overlap considerably and are closer to yellow, blue-ish green and blue. Humans have three types of colour-sensitive cells in the retinas of our eyes, which have different colour sensitivities. We’re used to describing skin colour with colour-words, such as brown, pink, white, black or even yellow, but from a colour science perspective, we’re all orange.ĭoes colour really affect our mind and body? A professor of colour science explainsĬolour is defined by our perception, not by physics. If we reflected one colour much more than the others, we’d appear to be a saturated colour. ![]() And human skins reflect broadly similar ratios of each colour of the spectrum. ![]() If you are lit by white light, from the sun or a bulb, the light hitting you contains the full visible spectrum of wavelengths.
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