MacAdam ellipses
Masstone
Matt, Matte
Lacking gloss.
Maxwell disk
Maxwell spot
Maxwell triangle
Mesopic vision
Metamerism
Metamers
Methuen handbook of colour
Metric of uniform colour space
Micro spaces
Microspectrophotometer
Monochromat
Monochromatism
Monochromator
Multi flux models
Munsell Book of colour
Munsell value polynomial
The early Munsell lightness scale (V) assumed the lightness was proportional to the square root of luminance (V = Y1/2 Priest 1920). This is only approximately true when samples of a grey scale are viewed against a white background. A different equation devised by Godlove and Munsell (1933) to represent samples viewed against a middle grey background. A slight modification of this relationship led to the Munsell Value scale (Newhall 1943). Later Glasser showed that a cube root function approximates the Munsell value polynomial quite well for values of Y greater than 1%.
Munsell-Godlove.
Cube root (Glasser).
Newhall.This 5th degree polynomial was used for the original ANLAB colour difference formula where Yn was the Y value of magnesium oxide (MgO) with the luminance factor set to 100. MgO, whose true luminance is approximately 97.5 makes the luminance factor of the perfect reflecting diffuser equal to 102.57. Sometimes a slightly different version of the Munsell value polynomial is seen, as follows:
here the value of the coeficients have been scaled slightly so the lightness (Y) has a value of 100 when V has a value of 10.