Masks by Xerography.

At first examination the odds seem to be against xerography as a useful tool for masking because of its small exposure range and because of the special steps required to reproduce large areas of uniform density. It is an object of this paper to show that both shortcomings may be overcome in a fashion that make xerography more flexible than other methods. Although a halftone method is used the dot pattern does not show on the final picture. The exposure range may be extended as far as necessary, the characteristic curve may be given any shape including a combination of positive and negative in the same picture. One single mask can be made to combine the colorimetric effects of several conventional masks. These features in connection with its speed, dimensional stability and low operating cost should make xerography, in the years to come, a welcome alternative to other methods of color correction.