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

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

Not Accessible

Your library or personal account may give you access

Abstract

A microphotometer has been designed and built to measure the granularity of photographic deposits in terms of two-dimensional variations in their transmitting properties. These measurements can be made in terms of either density or transmittance, and the diameters of the circular areas on which the measurements are made can be varied from 1.5μ to 78μ on the sample. Either ΔD or ΔT, the conventional density or transmittance differences from the mean, or SΔD, or SΔT, the syzygetic density or transmittance differences between immediately adjacent surface elements of equal area, are measured and recorded automatically. The instrument will make a reading, record this reading, and move the sample to a new area at the rate of approximately one reading every three seconds. When a sufficient number of readings, normally at least 300, have been made, the recorder plots the results as a frequency distribution curve.

© 1951 Optical Society of America

Full Article  |  PDF Article
More Like This
Photographic Granularity and Graininess. V. A Variable-Magnification Instrument for Measuring Graininess*

Loyd A. Jones and G. C. Higgins
J. Opt. Soc. Am. 41(1) 41-52 (1951)

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)

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 (13)

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

Select as filters


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