Abstract
Historically, some air quality monitoring programs have included color slides taken simply to qualitatively document the visual environment. The possibility of utilizing one such set of slides for quantitative analysis of visibility related indices is examined. This paper focuses on three-color digitization of the photos. An error analysis of contrast measurements from the slides shows them to be comparable to telespectroradiometer readings in overall accuracy, although absolute photometry is not possible. It is proposed that digitized photographs be used to determine spatially averaged visibility indices. Visible texture and fine contrast detail can be quantitatively addressed by Fourier analysis. The occurrence of regional haze can be assessed by the modulation depth of the slide. Modulation depth is the mean square deviation of the light levels divided by the average light level.
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