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PreucilPercentGreyness Preucil Percentage of Greyness.
PreucilPercentGreyness
PreucilPercentGreyness(RGBmatrix)
RGB coordinates
Percentage of Greyness
Robert William Gainer Hunt, 1987 The Reproduction of Colour Fountain Press Edition 4, illustrated
# NOT RUN { PreucilPercentGreyness(c(24,72,44)) # }
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