ON DYE CLOUD DIFFUSION AND THE IMAGE QUALITY OF COLOR NEGATIVE PHOTOGRAPHIC MATERIALS

Authors
Citation
Jr. Jarvis, ON DYE CLOUD DIFFUSION AND THE IMAGE QUALITY OF COLOR NEGATIVE PHOTOGRAPHIC MATERIALS, Journal of Photographic Science, 43(4), 1995, pp. 136-143
Citations number
25
Categorie Soggetti
Photographic Tecnology
ISSN journal
00223638
Volume
43
Issue
4
Year of publication
1995
Pages
136 - 143
Database
ISI
SICI code
0022-3638(1995)43:4<136:ODCDAT>2.0.ZU;2-N
Abstract
The impact of dye cloud diffusion on the signal recording and noise pr operties of a colour negative photographic material has been studied. A mathematical model has been established which quantitatively links m odulation transfer function (MTF), noise power spectrum and granularit y to the size and morphological features of dye clouds for a large var iation in cloud diffusion. The basic features of the model have been e xperimentally examined using three techniques for varying the extent o f dye diffusion; 1) A variation in image coupler laydown, 2) Adding a black-and-white developing agent to the colour developer solution and, 3) immersing a fully exposed and processed film strip in an alkaline alcohol-water solution. In all cases, the model was seen to describe i mage structure performance realistically. Also the link between colour negative dye cloud diffusion and predicted final print sharpness and graininess has been quantified.