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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 38, Iss. 11 — Nov. 1, 1948
  • pp: 897–917

Control of Photographic Printing: Improvement in Terminology and Further Analysis of Results

LOYD A. JONES and C. N. NELSON  »View Author Affiliations

JOSA, Vol. 38, Issue 11, pp. 897-917 (1948)

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Further study is made of the statistical correlation between the density scales of negatives and the sensitometric exposure scales of photographic papers. A formula relating these two variables is proposed, for use as a guide in photographic printing, whereby the density scale of the negative can be used as a means of choosing the grade of paper to be used in making the print. The suggestions of Sanders regarding statistical methods of analyzing the data are discussed. The term useful exposure scale is abandoned and the terms sensitometric exposure scale and transition point index are proposed. It is suggested that the sensitometric exposure scale be adopted as the basis for grading photographic papers and that the new numbers be called scale indices. Reasons are given why the contrast of photographic paper is not suitable as a basis for deriving grade numbers. For specifying the shapes of the D-logE curves of photographic papers, the method proposed by Morrison is recommended. Data are presented on the frequency of occurrence of the various density scales of amateur negatives.

LOYD A. JONES and C. N. NELSON, "Control of Photographic Printing: Improvement in Terminology and Further Analysis of Results," J. Opt. Soc. Am. 38, 897-917 (1948)

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  1. L. A. Jones and C. N. Nelson, "The control of photographic printing by measured characteristics of the negative," J. Opt. Soc. Am. 32, 558 (1942).
  2. A merican Standard for Sensitometry of Photographic Papers (American Standards Association, New York, 1947), Z38, 2.3.
  3. T. D. Sanders, "The relation between the density scale of negatives and the exposure scale of papers," Phot. J. 87B, 13 (1947).
  4. L. A. Jones and H. R. Condit, "The brightness scale of exterior scenes and the computation of correct photographic exposure," J. Opt. Soc. Am. 31, 651 (1941).
  5. L. A. Jones, "The contrast of photographic papers," J. Frank. Inst. 202, 177, 469, 589 (1926); 203, 111 (1927); 204, 41 (1927).
  6. L. A. Jones and C. A. Morrison, "Sensitometry of photographic papers," J. Franklin Inst. 228, 445 (1939).
  7. C. A. Morrison, "An objective method of specification for sensitometric curves of photographic papers," J. Franklin Inst. 243, 55 (1947).
  8. C. M. Tuttle, "Photoelectric photometry in the printing of amateur negatives," J. Franklin Inst. 224, 315 (1937).
  9. E. W. H. Selwyn, "Note on the use of probability paper," Proc. Phys. Soc. 50, 914 (1938).

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