About: Void pantograph

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An Entity of Type : yago:PsychologicalFeature100023100, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)
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In security printing, void pantograph refers to a method of making copy-evident and tamper-resistant patterns in the background of a document. Normally these are invisible to the eye, but become obvious when the document is photocopied. Typically they spell out "void", "copy", "invalid" or some other indicator message.

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rdf:type	yago:WikicatAuthenticationMethods yago:Ability105616246 yago:Abstraction100002137 yago:Cognition100023271 yago:Know-how105616786 yago:Method105660268 yago:PsychologicalFeature100023100
rdfs:label	Void pantograph (en)
rdfs:comment	In security printing, void pantograph refers to a method of making copy-evident and tamper-resistant patterns in the background of a document. Normally these are invisible to the eye, but become obvious when the document is photocopied. Typically they spell out "void", "copy", "invalid" or some other indicator message. (en)
dcterms:subject	Security Forgery Authentication methods Printing and writing paper
Wikipage page ID	40613228 (xsd:integer)
Wikipage revision ID	1123632365 (xsd:integer)
Link from a Wikipage to another Wikipage	Copy-evident Moire pattern Contrast ratio Low-pass filter Security Forgery Aliasing Authentication methods Printing and writing paper Luminance Security printing Tamper-resistant
sameAs	Void pantograph Void pantograph Void pantograph Void pantograph
dbp:wikiPageUsesTemplate	dbt:Reflist
has abstract	In security printing, void pantograph refers to a method of making copy-evident and tamper-resistant patterns in the background of a document. Normally these are invisible to the eye, but become obvious when the document is photocopied. Typically they spell out "void", "copy", "invalid" or some other indicator message. Void pantographs work by exploiting the limitations and features of copying equipment. A scanner or photocopier will act as a low-pass filter on the original image, blurring edges slightly. It will also not be perfectly aligned with the directions of the document, causing aliasing. Features smaller than the resolution will also not be reproduced. In addition, human vision is sensitive to luminance contrast ratio. This means that if a grey region consists of a grid of very small dark dots the filtering will produce a lighter grey, while a region of larger dots will be affected differently ("big-dot-little-dot"). This makes it possible to see a pattern that had been invisible. Numerous variations exist, including printing the marks using a raster of lines in one direction on a background of lines in another direction, or using fine line patterns that alias into a visible moire pattern when copied. (en)
prov:wasDerivedFrom	wikipedia-en:Void_pantograph?oldid=1123632365&ns=0
page length (characters) of wiki page	2375 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Void_pantograph
is Link from a Wikipage to another Wikipage of	Security paper Copy-evident document Pantograph (disambiguation) Security printing
is Wikipage disambiguates of	Pantograph (disambiguation)
is foaf:primaryTopic of	wikipedia-en:Void_pantograph

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