Safety file printing method suitable for multi printing devices

In current shading printing technique of preventing copy, background shading is covered by white region in large area some times so as to affect printing effect of shading of preventing copy severely. Analyzing driver of printer and interpreting content of file, the disclosed method generates dot ma...

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Bibliographic Details
Main Authors WANG LIDONG, QI WENFA, YANG BIN
Format Patent
LanguageChinese
English
Published 23.01.2008
Subjects
CALCULATING
COMPUTING
COUNTING
HANDLING RECORD CARRIERS
PHYSICS
PRESENTATION OF DATA
RECOGNITION OF DATA
RECORD CARRIERS
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Summary:In current shading printing technique of preventing copy, background shading is covered by white region in large area some times so as to affect printing effect of shading of preventing copy severely. Analyzing driver of printer and interpreting content of file, the disclosed method generates dot matrix data of shading for preventing copy, and recognizes all image areas in the file as well as determines their union set. Then, based on scope of areas represented by the union set, white color is filled to the part corresponding to dot matrix data of shading for preventing copy. Finally, dot matrix data of shading and dot matrix data of file being superposed, the superposed data are printed out. At any printing environment, the invention raises effect of printing shading for preventing copy.
Bibliography:Application Number: CN200510134320