Abstract

The calorimetric scales of recent Hunter and Adams proposals are studied in terms of the smoothed curves of the Munsell renotation space. Three conversion tables prepared provide: I.C.I. (X, Y, Z) data; Adams’ chromatic value data; Hunter’s a and b. Each table extends to the theoretical hue, value, and chroma limits of the original table. Such use of Munsell renotation data makes it possible to visualize the color spacing of the coordinates of any color measuring instrument that is based upon or related to the I.C.I. system, and makes it possible to understand instrument results in terms of color experience, and thus assess the accuracy and precision of an instrument in terms of standard colorimetric practice and known color tolerance.

© 1950 Optical Society of America

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References

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  1. R. S. Hunter, J. Opt. Soc. Am. 30, 536 (1940); J. Research Nat. Bur. Stand. 25, 581 (1940), (RP1345).
    [Crossref]
  2. R. S. Hunter, J. Opt. Soc. Am. 32, 509 (1942); Nat. Bur. Stand. (U. S. Circ.) C429 (1942).
    [Crossref]
  3. R. S. Hunter, J. Opt. Soc. Am. 38, 661(A) (1948).
  4. R. S. Hunter, J. Opt. Soc. Am. 381094(A) (1948).
  5. E. Q. Adams, J. Opt. Soc. Am. 32, 168 (1942).
    [Crossref]
  6. E. Q. Adams, J. Opt. Soc. Am. 36, 717(A) (1946).
  7. D. Nickerson, “Interrelation of color specifications” (U. S. Department of Agriculture, February, 1947), 45 pp., processed; Pap. Trade J. 125, 153 (1947).
  8. Newhall, Nickerson, and Judd, J. Opt. Soc. Am. 33, 385 (1943), Table II, p. 406; the formula is a quintic parabola, p. 417.
    [Crossref]
  9. R. W. Burnham, J. Opt. Soc. Am. 38, 387 (1949).
    [Crossref]
  10. Newhall, Nickerson, and Judd, J. Opt. Soc. Am. 33, 385 (1943).
    [Crossref]

1949 (1)

R. W. Burnham, J. Opt. Soc. Am. 38, 387 (1949).
[Crossref]

1948 (2)

R. S. Hunter, J. Opt. Soc. Am. 38, 661(A) (1948).

R. S. Hunter, J. Opt. Soc. Am. 381094(A) (1948).

1946 (1)

E. Q. Adams, J. Opt. Soc. Am. 36, 717(A) (1946).

1943 (2)

1942 (2)

1940 (1)

J. Opt. Soc. Am. (9)

Other (1)

D. Nickerson, “Interrelation of color specifications” (U. S. Department of Agriculture, February, 1947), 45 pp., processed; Pap. Trade J. 125, 153 (1947).

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Figures (3)

Fig. 1
Fig. 1

Munsell renotations for 5/ value converted to Adams’ “chromatic value” diagram.

Fig. 2
Fig. 2

Munsell renotations for 5/ value converted to Hunter (a, b)-diagram: a=175fY(1.02XY); b=70fY(Y−0.847Z).

Fig. 3
Fig. 3

Five color samples in the cotton color range plotted on Hunter scales Rd and +b (percent reflectance and degree of yellowness) according to data calculated (○) from NBS spectrophotometric measurements, and from direct measurements (×) of the same samples on the Hunter color and color-difference meter. Munsell renotation points for 10 YR 7–9 value, 1–4 chroma, indicate the size of color difference involved. Applying photometric scale corrections for this instrument makes agreement between theory and direct colorimetric measurement in this color range quite satisfactory.

Tables (1)

Tables Icon

Table I Data on five papers in the cotton color range based on measurements on the G. E. spectrophotometer and on the Hunter color and color-difference meter.

Equations (4)

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a = 175 f Y ( 1.02 X - Y ) b = 70 f Y ( Y - 0.847 Z )
R d = 100 Y
L = f Y R d .
a A = ( V X - V Y ) b A = 0.4 ( V Z - V Y ) V = Munsell value function