Abstract
A comparison is made of results obtained from the literature on small-area-colors, threshold tritanopia and threshold measurements with coloured, and black and white gratings. Additional experiments with heterochrome square-wave gratings were conducted. Thresholds were ascertained (1) for detection of the grating's direction and (2) for the correct qualitative description of the two colours. In a further experiment the colours of the grating were compared to a neighbouring field whose colour could be varied, parameter being the spatial frequency of the grating. These measurements supplied a “modulation transfer factor” for the colour perception of the entire visual system. Its usefulness is discussed in a review encompassing own measurements and the results which other authors received from related experiments.
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