| 摘要 |
A method and system for including a double layer security mark in digital document data defining an image of a document to be printed and in the printed document. A fluorescence mark region including a fluorescence mark is defined using first and second metameric colorant mixtures. Variation in colorant spatial coverage between the first and second metameric colorant mixtures results in colorant-free areas that define the fluorescence mark due to substrate fluorescence under UV illumination. The fluorescence mark region is modified to define a double layer fluorescence mark region including the fluorescence mark and also including at least one visible light object defined by a third colorant mixture. The third colorant mixture is added to the fluorescence mark region by masking the colorant-free areas of the fluorescence mark region to prevent writing of the third colorant mixture data to the colorant-free areas to avoid disturbing the colorant-free areas.
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