Abstract
SUMMARYBy means of a method of ratio estimation, scale values were obtained for the subjective brightness of various physical intensities of monochromatic light characterized by wave lengths 459, 471, 527, 554, 595, 627 and 672 mμ.The brightness functions were studieed by plotting the scale values against stimulus intensity for each wave length. The curves for 459, 471 and 672 mμ exhibited a sigmoid form, indicating that a probability function may be involved in the function relating brightness to stimulus intensity for these wave lengths. The trend of the other curves was negatively accelerated, but it is possible that an inflexion point may be located below the experimental range.The difference in form between the brightness functions can explain certain empirical relations between brightness, hue and saturation.
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