Mar 12, 2013 I am trying to create a void pantograph. I have experimented with numerous halftone screen frequency and angle combinations but still haven't found the magic formula. I am working on the basis of background 130lpi and the viod text at 65lpi. I have tried many variations of colour from 5% to 15%. The magic formula still eludes me. Our z-fold laser check format features micro print security, security block outs, void pantograph, and endorsement backer. Letter size (8.5” x 11) stock. When used for printing laser checks, requires check writing software and use of MICR toner (magnetic toner).
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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.[1]
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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. Audacity mac pro download. 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 luminancecontrast 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.[1][2] Numerous variations exist, including printing the marks using a raster of lines in one direction on a background of lines in another direction,[3] or using fine line patterns that alias into a visible moire pattern when copied.[4]
References[edit]
Void Pantograph Printing
- ^ abJason S. Aronoff, Steven J. Simske, Margaret Sturgill. Automated Optimization of Void Pantograph Settings. HP LaboratoriesHPL-2011-179 http://www.hpl.hp.com/techreports/2011/HPL-2011-179.pdf
- ^J. Kim, K. Kim, J. Lee and J Choi, 'Development of Visible Anticopy Patterns,' in TrustBus 2004, LNCS 3184, pp. 209-218 (2004)
- ^John R. Volpe. Printing method and copy-evident secure document. US patent 5487567 http://www.google.com/patents/US5487567
- ^George K. Phillips. New Digital Anti-Copy/Scan and Verification Technologies. In: Optical Security and Counterfeit Deterrence Techniques V, San Jose, California; June 3, 2004; p. 133-141; ISBN0-8194-5213-0
Free Digital Pantographs
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