Tuesday, November 17, 2009
The last significant additive screen process to be introduced was a modification of the original Dufay dioptichrome process from before WWI. First released as a motion picture film in 1932, it was introduced for still photography in 1935 in roll, sheet, and film pack forms. A very fine screen structure, increased sensitivity, and simple reversal processing kept it in use into the 1950s for still photography.
Its use in motion pictures was short lived, though long enough to produce a number of feature-length films in the 1930s. Although not present on this sample from the Eastman House Film Technology Collection, a variable density soundtrack could be printed successfully into the image area.