Method of color measuring a color of a rendered copy of a digital image, by a color-measuring-device (3000) for color measuring in a plurality of spectral ranges (r1 . . . rQ); wherein said method comprises the step: measuring said color is measured in a sub-set (s1 . . . sM; 3305) of said plurality of spectral ranges (r1 . . . rQ); and wherein said sub-set (s1 . . . sM) is determined by: selecting a color of a gamut boundary of said digital image (1200); and determining of said color for said plurality of spectral ranges (r1 . . . rQ) corresponding spectral reflectance factors (v1 . . . vQ); and adding a spectral range (ri), having a minimum and maximum spectral reflectance factor, to said sub-set (s1 . . . sM) wherein its corresponding spectral reflectance value (vi) is larger than 10% of said maximum spectral reflectance factor minus said minimum spectral reflectance factor.