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2. Void pantograph - Wikipedia

   en.wikipedia.org/wiki/Void_pantograph

   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. [1]

3. 1951 USAF resolution test chart - Wikipedia

   en.wikipedia.org/.../1951_USAF_resolution_test_chart

   A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.

4. Category:Chart patterns - Wikipedia

   en.wikipedia.org/wiki/Category:Chart_patterns

   Download as PDF; Printable version; In other projects Wikidata item; ... Pages in category "Chart patterns" The following 11 pages are in this category, out of 11 ...

5. Copy-evident document - Wikipedia

   en.wikipedia.org/wiki/Copy-evident_document

   Copy-evident documents have features that make it detectable that a copy is not the original. In security printing , various methods such as void pantograph are used to create patterns that are hard to copy exactly and when copied inexactly produces an easily detectable image.

6. Screentone - Wikipedia

   en.wikipedia.org/wiki/Screentone

   Three shapes overlaid with different screentone patterns. Screentone is a technique for applying textures and shades to drawings, used as an alternative to hatching.In the conventional process, patterns are transferred to paper from preprinted sheets. [1]

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8. Security printing - Wikipedia

   en.wikipedia.org/wiki/Security_printing

   The advantage of a digital press is that in a single pass through the printer a void pantograph with all the variable data can be printed on plain paper. Copy-evident paper, sometimes marketed as ‘security paper’, is pre-printed void pantograph paper that was usually produced on an offset or flexographic press. The quality of the void ...

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