Abstract

A completely objective system for equivalent-neutral-density calibration of a set of photographic film images from a subtractive color process is described. It includes these elements:

  • 1. Restrictions on spectral density distributions of possible component absorbers are established by determining eigenvectors of the spectral density variability of images from the process;
  • 2. Estimates of spectral density distributions of individual process dyes are adjusted to conformance with the restriction;
  • 3. Spectral density distributions of process-formed gray images are predicted by combining spectral densities of actual process images with just-sufficient amounts of (two of) the conforming dyes;
  • 4. Equivalent neutral densities of the third dye in the images are colorimetrically computed from the predicted gray-image distribution.

© 1954 Optical Society of America

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References

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  1. American Standards Association, American Standard for Diffuse Transmission Density. Z38.2.5 (1946).
  2. G. Heymer and D. Sundhoff, Veröffentl. wiss. Zentral-Labs. phot. Abt. Agfa,  5, 62 (1937).
  3. R. M. Evans, J. Soc. Motion Picture Engrs. 31, 194 (1938).
  4. II. R. H. Morris and J. H. Morrissey, J. Opt. Soc. Am. (to be published in July, 1954).
  5. III. Holland, Mickelson, and Powers, J. Opt. Soc. Am. (to be published in July, 1954).
  6. See also Evans, Hanson, and Brewer, Principles of Color Photography (John Wiley and Sons, Inc., New York, 1953), pp. 425–426 and441–449.
  7. See reference 6, pp. 435–437.

1946 (1)

American Standards Association, American Standard for Diffuse Transmission Density. Z38.2.5 (1946).

1938 (1)

R. M. Evans, J. Soc. Motion Picture Engrs. 31, 194 (1938).

1937 (1)

G. Heymer and D. Sundhoff, Veröffentl. wiss. Zentral-Labs. phot. Abt. Agfa,  5, 62 (1937).

Brewer,

See also Evans, Hanson, and Brewer, Principles of Color Photography (John Wiley and Sons, Inc., New York, 1953), pp. 425–426 and441–449.

Evans,

See also Evans, Hanson, and Brewer, Principles of Color Photography (John Wiley and Sons, Inc., New York, 1953), pp. 425–426 and441–449.

Evans, R. M.

R. M. Evans, J. Soc. Motion Picture Engrs. 31, 194 (1938).

Hanson,

See also Evans, Hanson, and Brewer, Principles of Color Photography (John Wiley and Sons, Inc., New York, 1953), pp. 425–426 and441–449.

Heymer, G.

G. Heymer and D. Sundhoff, Veröffentl. wiss. Zentral-Labs. phot. Abt. Agfa,  5, 62 (1937).

Holland,

III. Holland, Mickelson, and Powers, J. Opt. Soc. Am. (to be published in July, 1954).

Mickelson,

III. Holland, Mickelson, and Powers, J. Opt. Soc. Am. (to be published in July, 1954).

Morris, R. H.

II. R. H. Morris and J. H. Morrissey, J. Opt. Soc. Am. (to be published in July, 1954).

Morrissey, J. H.

II. R. H. Morris and J. H. Morrissey, J. Opt. Soc. Am. (to be published in July, 1954).

Powers,

III. Holland, Mickelson, and Powers, J. Opt. Soc. Am. (to be published in July, 1954).

Sundhoff, D.

G. Heymer and D. Sundhoff, Veröffentl. wiss. Zentral-Labs. phot. Abt. Agfa,  5, 62 (1937).

American Standard for Diffuse Transmission Density. Z38.2.5 (1)

American Standards Association, American Standard for Diffuse Transmission Density. Z38.2.5 (1946).

J. Soc. Motion Picture Engrs. (1)

R. M. Evans, J. Soc. Motion Picture Engrs. 31, 194 (1938).

Veröffentl. wiss. Zentral-Labs. phot. Abt. Agfa (1)

G. Heymer and D. Sundhoff, Veröffentl. wiss. Zentral-Labs. phot. Abt. Agfa,  5, 62 (1937).

Other (4)

II. R. H. Morris and J. H. Morrissey, J. Opt. Soc. Am. (to be published in July, 1954).

III. Holland, Mickelson, and Powers, J. Opt. Soc. Am. (to be published in July, 1954).

See also Evans, Hanson, and Brewer, Principles of Color Photography (John Wiley and Sons, Inc., New York, 1953), pp. 425–426 and441–449.

See reference 6, pp. 435–437.

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Figures (1)

F. 1
F. 1

Procedure for primary Kodak Ektachrome Film equivalent neutral density calibration of a reference set of color patches, and Types 17 and 31 Densitometers.

Equations (1)

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D = log 10 P 0 P t ,