Abstract

A resolving power criterion is used to evaluate a method which utilizes the Herschel effect to improve the resolution of aerial photographs. The maximum resolving power is increased and the useful exposure range is considerably widened in a Herschel print. To minimize exposure times, the sensitivity of Kodabromide paper to the Herschel effect is increased by a desensitizer. Although equivalent resolution may be obtained by the use of unsharp masks, the economy of time and material in the Herschel method makes it superior for application to mass printing operations.

© 1951 Optical Society of America

Full Article  |  PDF Article

References

  • View by:
  • |
  • |
  • |

  1. L. E. Howlett, Can. J. Research A24, 1 (1946).
    [Crossref]
  2. L. E. Howlett, Can. J. Research A26, 60 (1948).
    [Crossref]
  3. L. E. Howlett and D. L. Matthews, J. Opt. Soc. Am. 41, 752 (1951).
    [Crossref]
  4. J. A. C. Yule, Phot. J. 84, 321 (1944).
  5. B. H. Carroll and C. M. Kretchman, J. Research Natl. Bur. Standards 10, 449 (1933). Research Paper No. 541.
    [Crossref]
  6. G. Kornfeld, J. Opt. Soc. Am. 39, 490 (1949).
    [Crossref]
  7. , November, 1947.

1951 (1)

1949 (1)

1948 (1)

L. E. Howlett, Can. J. Research A26, 60 (1948).
[Crossref]

1946 (1)

L. E. Howlett, Can. J. Research A24, 1 (1946).
[Crossref]

1944 (1)

J. A. C. Yule, Phot. J. 84, 321 (1944).

1933 (1)

B. H. Carroll and C. M. Kretchman, J. Research Natl. Bur. Standards 10, 449 (1933). Research Paper No. 541.
[Crossref]

Carroll, B. H.

B. H. Carroll and C. M. Kretchman, J. Research Natl. Bur. Standards 10, 449 (1933). Research Paper No. 541.
[Crossref]

Howlett, L. E.

L. E. Howlett and D. L. Matthews, J. Opt. Soc. Am. 41, 752 (1951).
[Crossref]

L. E. Howlett, Can. J. Research A26, 60 (1948).
[Crossref]

L. E. Howlett, Can. J. Research A24, 1 (1946).
[Crossref]

Kornfeld, G.

Kretchman, C. M.

B. H. Carroll and C. M. Kretchman, J. Research Natl. Bur. Standards 10, 449 (1933). Research Paper No. 541.
[Crossref]

Matthews, D. L.

Yule, J. A. C.

J. A. C. Yule, Phot. J. 84, 321 (1944).

Can. J. Research (2)

L. E. Howlett, Can. J. Research A24, 1 (1946).
[Crossref]

L. E. Howlett, Can. J. Research A26, 60 (1948).
[Crossref]

J. Opt. Soc. Am. (2)

J. Research Natl. Bur. Standards (1)

B. H. Carroll and C. M. Kretchman, J. Research Natl. Bur. Standards 10, 449 (1933). Research Paper No. 541.
[Crossref]

Phot. J. (1)

J. A. C. Yule, Phot. J. 84, 321 (1944).

Other (1)

, November, 1947.

Cited By

OSA participates in Crossref's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (3)

Fig. 1
Fig. 1

Resolving power—log film exposure curves for Kodabromide F.3 glossy paper. Ordinary print, white exposure only; direct Herschel print, red exposure of 5 minutes with three Wratten No. 70 filters; desensitized Herschel print, red exposure of 1 2 minute with Wratten No. 25 filter; unsharp mask of gamma 0.37.

Fig. 2
Fig. 2

Characteristic curves of Kodabromide F.3 paper before and after red exposure. (a) white exposure only, (b) red exposure of 5 minutes with three Wratten No. 70 filters.

Fig. 3
Fig. 3

Characteristic curves of desensitized Kodabromide F.3 paper before and after red exposure. (c) white exposure only, (d) red exposure 1 2 minute, (e) red exposure 1 1 2 minutes. (d) and (e), Wratten No. 25 filter.