Patent ID: 11968345
Assignee: INNOVIEW SARL
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method for creating an authenticable color halftone print made of juxtaposed clusters of dispersed dots comprising the steps of:
creating a screen element with juxtaposed clustered dots, the areas of said juxtaposed clustered dots being determined by surface coverages of colorants present within the screen element;
generating the juxtaposed clusters of dispersed dots through a dispersed dot halftoning procedure applied to the juxtaposed clustered dots, said juxtaposed clusters of dispersed dots formed by sets of densely spaced segments, partly or fully enclosed by non-printable boundaries within areas of said juxtaposed clustered dots;
tuning the dispersed dot halftoning procedure by defining ink level reduction factors specifying surface ratios of segments within said sets of densely spaced segments;
printing the juxtaposed clusters of dispersed dots by transferring them onto a color printer;
wherein:
for a fluorescent color reproduction workflow, the ink level reduction factors are optimized to obtain under UV light fluorescent achromatic gray and white colors,
authentication is performed on the authenticable color halftone print by verifying that characteristic features of said juxtaposed clusters of dispersed dots are present.