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ABSTRACT
Psychophysical relationships were determined between visual granularity and both intervals and ratios of graininess. Visual granularity can be calculated as the vector sum of appropriately weighted ISO Status A red, green, and blue granularities. Appropriate, unequal weightings are those that provide highest correlation with visual contrast sensitivity as a function of wavelength, which implies that graininess is a singular form of contrast perception regardless of the chromaticity of a sample. Intervals of graininess were found to be linearly related to logarithms of visual granularity and ratios of graininess were found to be a power function, with an exponent of two, of visual granularity. Graininess intervals are then linearly related to logarithms of graininess ratios. A convenient logarithmic relationship is one that uses the dyadic (or binary) base in order to define graininess ‘bits’. The unit of the graininess bit scale corresponds to a factor of two in graininess ratios. Because the exponent of the psychophysical function relating visual granularity to graininess ratios is two, a factor of two in granularity is represented by two units on the scale of graininess bits, which corresponds to a factor of four in ratios of graininess.