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With the luminance contributions so adjusted, Eqs. (11), (15), and (16) take the simple form given at a later point in the text.
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The UCS diagram hereafter referred to in this paper is that just cited.
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W. T. Wintringham of these laboratories has called our attention to the fact that the measured densities might not be accurate for the projection system used in the experiment. Our measurement yielded diffuse density whereas the more appropriate parameter might be specular density. The ratio of the specular to diffuse density is known as the Callier-Q factor and is a function of photographic gamma and density. The effect of this factor is not a simple one to evaluate in terms of our experiment, but we are currently pursuing this aspect.
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