Abstract
Photographic and photometric effects causing different shapes of blackening curves between line and continuous spectra were investigated. The predominant part of the scattered light which causes a systematic error in the optical density measurements originates from silver grains in the immediate vicinity of the measured area of the photographic emulsion, therefore its intensity depends upon the density of the neighbouring field. Consequently the contribution of scattered light to the total flux increases with decreasing line-width and with increasing contour sharpness, while in the case of continuous spectra it is significantly lower. However, the γ L value of line spectra is higher than the γ U of continuous spectra. It was established that the γ L+U value obtained by superimposing line and continuous spectra decreases as a saturation function with increasing background density S U . A simple relationship was found between γ L+U and the values of γ L and γ U .
Published Version
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