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In XYZ space, gray doesn't have three equal values. Instead, it is a line through the whitepoint. (Multiplying by the whitepoint has the same effect as multiplying the sRGB matrix with a (g, g, g) vector, since the numbers on the matrix's rows add up to the whitepoint.) Fixes the very slight red tint on all the figures in chapter 4 of the PDF 1.7 spec.