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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 34, Iss. 9 — Sep. 1, 1944
  • pp: 550–568

Color Tolerance Specification

DOROTHY NICKERSON and KEITH F. STULTZ  »View Author Affiliations

JOSA, Vol. 34, Issue 9, pp. 550-568 (1944)

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DOROTHY NICKERSON and KEITH F. STULTZ, "Color Tolerance Specification," J. Opt. Soc. Am. 34, 550-568 (1944)

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  1. Italic numbers in parentheses refer to literature cited at end of this paper.
  2. For a discussion of color concepts refer to "The concept of color," O.S.A. Colorimetry Committee Report, J. Opt. Soc. Am. 33, 552 (1943), Fig. 3.
  3. The MacAdam report based on the Nutting observations can be made the basis for setting tolerances, but not so directly and conveniently unless an approximate representation of the MacAdam data in 3-dimensional space is employed.
  4. The square of rho (P2), though lower than P, is used hereafter in this paper for it seems a more useful number than P to use to represent the degree of correlation. P (rho) represents multiple linear correlation, R represents simple linear correlation.
  5. Suggestions regarding differences in relations of value to hue and chroma, depending upon conditions of observation, are discussed in a recent paper (36), with illustrations of two such solids, and any final tolerance formula based on this concept should include a term that will provide adjustment in accord with conditions of observation.
  6. The figures are usually read to the nearest 0.5 step of hue and nearest 0.1 step of chroma, with value read to the second decimal place as given in Table II of the O.S.A. report. When adjustments are made for hue and chroma for interpolation between two value charts the results are carried to one decimal place for hue and two places for chroma in order to avoid rejection errors. It is not implied that color differences as small as 0.1 hue step or 0.01 chroma step can be recognized.
  7. Development of this formula is given in detail by Hunter in (18), pp. 519–521.
  8. See Table II of reference (32).
  9. Dr. Judd comments on this breakdown in the Inter-Society Color Council's Discussion Session on Small Color Differences, published in the Am. Dyestuff Rept. 33, 231 ff. (1944).

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