Abstract

Color filters used in densitometry have usually been made of gelatin and glass combinations. During the past few years interference filters have become available which provide greatly improved densitometry because of their inherently greater stability and narrower pass bands. Tricolor and sound track densitometry can at present be very well accomplished employing Fabry-Perot type filters. Multilayer Fabry-Perot filters may prove to be even superior. Fabry-Perot filters can also be used in a color densitometer to convert it to an abridged spectrophotometer. Excellent near infrared elimination in color densitometers can be accomplished through means of dichroic filters.

© 1954 Optical Society of America

Controllable Interference-Type Optical Filter

Richard Blythe
J. Opt. Soc. Am. 44(4) 336-339 (1954)

Densitometry and Photographic Printing. Illumination of the Negative and Its Effect upon Density*

Clifton Tuttle
J. Opt. Soc. Am. 24(10) 272-278 (1934)

An Objective Method for Determination of Equivalent Neutral Densities of Color Film Images. III. Densitometer Calibrations*

F. H. Holland, R. S. Mickelson, and S. A. Powers
J. Opt. Soc. Am. 44(7) 534-539 (1954)

Analytical Densitometry for Color Print Evaluation

Judith W. Onley
J. Opt. Soc. Am. 50(2) 177-182 (1960)

A Mosaic Filter Daylight Source for Aerophotographic Sensitometry in the Visible and Infrared Region

Max R. Nagel
J. Opt. Soc. Am. 44(8) 621-624 (1954)