Embedding digital watermarks in spot colors
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United States of America Patent
Stats
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Jan 31, 2006
Grant Date -
Mar 27, 2003
app pub date -
Sep 25, 2001
filing date -
Sep 25, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The present invention relates to digitally watermarking spot color images. In one embodiment, an original spot color is replaced with a combination of cyan (C), magenta (M) and yellow (Y) components and the original spot color. The CMY components convey a digital watermark. Preferably, a large percentage halftone process screens the spot color. This screened spot color is combined with the CMY components. Combining the CMY components with a large percentage halftone screening results in a watermarked image color that closely approximates to the original spot color. In another embodiment, a spot color is halftone-screened to a percentage of its original intensity. The screened-back spot color is modulated to accommodate a watermark signal.
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