Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Photographic Granularity and Graininess. VIII.

Not Accessible

Your library or personal account may give you access

Abstract

It is shown that, when a photographic image of uniform density is viewed under such conditions that graininess is just perceptible, the average spatial luminance gradient on the cones of the eye is a function of the density of the sample alone if the illuminance on the sample is held constant. This function, which bears a logarithmic relation to net density and is independent of the nature of the photographic image, is herein termed the threshold gradient sensitivity function of the eye for graininess. Granularity is defined in terms of the diameter of the scanning aperture that will produce this threshold gradient on the cones of the eye for the density of the sample in question. It is shown that granularity as thus expressed can be multiplied by a constant factor to give the same numerical value of threshold graininess that would be obtained by measuring the sample visually under standard conditions.

© 1955 Optical Society of America

Full Article  |  PDF Article
More Like This
Some Theoretical Considerations on Photographic Graininess and Granularity*

J. H. Webb
J. Opt. Soc. Am. 45(5) 379-388 (1955)

Photographic Granularity and Graininess. IX. Techniques and Equipment for the Objective Measurement of Graininess*

L. A. Jones, G. C. Higgins, K. F. Stultz, and H. F. Hoesterey
J. Opt. Soc. Am. 47(4) 312-321 (1957)

Photographic Granularity and Graininess. VII. A Microphotometer for the Measurement of Granularity*

L. A. Jones and G. C. Higgins
J. Opt. Soc. Am. 41(3) 192-200 (1951)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (7)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Tables (1)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (2)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved