| http://www.w3.org/ns/prov#value | - Indeed, combining an inverted watermark signal ???tweak??? or ???bump??? in a K channel, with a corresponding non-inverted watermark signal tweak or bump in the CMY channels effectively cancels an overall perceived luminance change???effectively reducing visibility of the digital watermark. [0063] Watermark Detection [0064] Another aspect of the present invention is a detection method and system f
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