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saturation
colourfulness of an area judged in proportion to its brightness
Note 1 to entry: For given viewing conditions and at luminance levels within the range of photopic vision, a colour stimulus of a given chromaticity exhibits approximately constant saturation for all luminance levels, except when the brightness is very high.
Note 2 to entry: This entry was numbered 845-02-41 in IEC 60050-845:1987.
Note 3 to entry: This entry was numbered 17-1136 in CIE S 017:2011.