Journal of the Society of Motion Picture and Television Engineers (1950-1954)

Record Details:

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£=.001 0 100 Bs = .OlmL — 1 ,,-'-' ' t^^^a ^s' / / / / ^ / / </4 // / / / / / l I 10 1 l 1 i l i . j^> / <i t 1 ,/ V 400 500 l( 100 / / I. ^^ x/ f / ft 1 J _ ^y / ?£. — 0 / / / _ri ^^ \ V" / >-' io'6 to'5 io"4 io"3 io"2 io~' i Bg TEST FIELD LUMINANCE ffs ~ MAX. HIGHLIGHT LUMINANCE Fig. 14. Subjective Response (6 = .001). In the simpler case where the Weber-Fechner law is followed, that is, where AB is proportional to B, the integration yields the result given in equation (15). Where the Moon and Spencer formula is assumed, the appropriate expression from equations (18) and (20) is introduced in the integrand. In this instance, the integration is rather laborious but straightforward. The results have been plotted in Figs. 12 to 15, inclusive, each plot being for a different assumed value of the parameter b. Each plot shows the cumulative perceptible steps from the maximum luminance value Bs in the field, down to a specified ratio BB/BS 24