Photographic simulation of density differences as changes of...

Details Photographic simulation of density differences as changes of... Photographic simulation of density differences as changes of...

G - Physics

03

F

95/25, 96/258, 2

G03F 5/00 (2006.01) B41M 3/14 (2006.01) B42D 15/00 (2006.01) G03C 5/02 (2006.01) G03C 5/08 (2006.01)

Patent

CA 1066109

ABSTRACT OF THE DISCLOSURE The invention relates to a photographic technique for generating a line pattern for use in creating medallion effects on printed documents or for anti-counterfeiting purposes and the like. A high-contrast line screen negative is prepared and a positive generated from the negative. The positive is then superposed on the negative but offset therefrom by the width of a thin line of the resulting image. The combined line pattern creates a medallion effect when the line spacing is comparable in dimensions to the image detail. The resulting pattern may also be used in conjunction with a finding screen or superimposed line pattern to regenerate visual information that appears in hidden or subdued form in the photographic pattern per se.

239412

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