Abstract
Two halves of a sinusoidally modulated transparency were projected on a diffusing surface. The contrast C of one half of the field was changed by defocusing until a definite difference of contrast, ΔC, was perceived. The contrast of either half of the field could be changed without changing the mean luminance. A plot of ΔC/C against C declines monotonically with increasing contrast. On the other hand, ΔC against C has a maximum at an intermediate contrast. The contrast difference ΔC can be interpreted as relative luminance difference ΔL/L, to which the Weber law applies. A function relating subjective to objective contrast was obtained. The relation between modulation transfer function (MTF) with constant input and constant output is discussed.
© 1972 Optical Society of America
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