Julian Lopez


The tone reproduction curve of small-scale images on KODALITH film developed with KODALITH Super Developer were obtained by microdensitometry using a sinusoidal target of 64 percent modulation as a sensitometric tablet to produce images at spatial frequencies corresponding to screen rulings of 9 to 375 lines/inch. A similar series of exposures was processed with addition of sulfite to the developer to give essentially noninfectious development. Speed and contrast with KODALITH developer increased with spatial frequency; speed increased continuously by a small factor and contrast passed through a maximum (80 percent greater than for large area image) at a spatial frequency between 3/8 and 3 cycles/millimeter then decreased with increasing spatial frequency back to the large image level. The contrast and speed for noninfectious development were essentially independent of spatial frequency. The change in speed and contrast for both the infectious and noninfectious development were relatively independent of exposure level.

Library of Congress Subject Headings

Photography--Printing processes--Toning; Photography--Processing

Publication Date


Document Type


Department, Program, or Center

School of Photographic Arts and Sciences (CIAS)


Carroll, Burt


Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works. Physical copy available through RIT's The Wallace Library at: TR335.L6


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