Abstract

If a set of colorants is to be used in making large numbers of specified colors, a calibration of the relationship between colorant composition and colorimetric specifications provides a very efficient means of procedure. In the case discussed, samples exemplifying the Munsell renotation were painted from such a calibration. A set of six chromatic paints plus black and white was first chosen on the basis of color gamut, fastness, and other physical properties. Since mixtures of two chromatic paints plus black and white provide three degrees of freedom, such mixtures are sufficient to obtain any color within the gamut of the chosen paints. The required calibration, therefore, must relate the ratios of chromatic paints, black, and white to colorimetric specifications within the gamut. This calibration was made by painting samples of a constant ratio type colorant mixture system, determining the CIE and Munsell specifications, then establishing graphs of the relation between colorant ratios and color coordinates. The mixture formulas for the desired Munsell renotation samples were then read from these graphs.

© 1955 Optical Society of America

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References

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  1. H. R. Davidson and H. Luttringhaus, J. Opt. Soc. Am. 41, 623–625 (1951).
    [Crossref]

1951 (1)

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Figures (7)

Fig. 1
Fig. 1

Mixture diagram for variations in white and black where the chromatic pigment ratio is 60 percent orange to 40 percent yellow.

Fig. 2
Fig. 2

Mixture diagram showing contours of constant chromatic pigment ratio for a ratio of 90 percent white and 10 percent black plus chromatic pigment.

Fig. 3
Fig. 3

Mixture diagram showing log percent color as a function of value at constant chroma for chromatic pigment ratio of 100 percent yellow.

Fig. 4
Fig. 4

Mixture diagram showing log percent black in black plus chromatic pigment ratio of 100 percent yellow.

Fig. 5
Fig. 5

Mixture diagram showing ratio of orange to yellow-orange as a function of hue at constant chroma for a ratio of 50 percent black plus chromatic pigment to 50 percent white.

Fig. 6
Fig. 6

Contours of constant ratios of black plus chromatic pigment to white in CIE coordinates at Munsell value 8/. Ratios are expressed in percent.

Fig. 7
Fig. 7

Contours of constant chromatic pigment ratios (radial lines) and constant ratios of black to black plus chromatic pigment in CIE coordinates at Munsell Value 8/. All ratios are expressed in percent.