[4.3.1.4] The attribute according to which it appears to exhibit more or less chromatic color when judged in proportion to the brightness of a similarly illuminated area that appears to be white or highly transmitting. In a given set of viewing conditions, and at luminance levels that result in photopic vision, a stimulus of a given chromaticity and luminance factor exhibits approximately constant perceived chroma for all illuminance levels; but for a stimulus of a given chromaticity viewed at a given level of illuminance, the perceived chroma generally increases if the luminance factor is increased.
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