An Objective Method for Determination of Equivalent Neutral Densities of Color Film Images I Definitions and Basic Concepts*
- 1 June 1954
- journal article
- Published by Optica Publishing Group in Journal of the Optical Society of America
- Vol. 44 (6) , 460-464
- https://doi.org/10.1364/josa.44.000460
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.Keywords
This publication has 1 reference indexed in Scilit:
- A Color Densitometer for Subtractive ProcessesJournal of the Society of Motion Picture Engineers, 1938