![void pantograph image void pantograph image](https://www.amgraf.com/media/void.gif)
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. This makes it possible to see a pattern that had been invisible. 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"). VP is one of the most widely used and accepted technologies used in security printing. On the original, the VOID or other message is hidden, but when photocopied it becomes visible. In addition, human vision is sensitive to luminance contrast ratio. Void pantograph (VP) is designed to protect originals against photocopying. Features smaller than the resolution will also not be reproduced. It will also not be perfectly aligned with the directions of the document, causing aliasing. A scanner or photocopier will act as a low-pass filter on the original image, blurring edges slightly. As such, the first void pantograph may be suitable for. The item may include a document, label, packaging, or other sort of material which is associated with a first void pantograph and machine-readable data. 4.2 VOID pantograph (At Printing Stage) In all new cheque forms, pantograph with hidden / embedded word VOID needs to be included at lower left hand corner (Please refer below mentioned image and sample cheque attached). Void pantographs work by exploiting the limitations and features of copying equipment. The void pantograph is an image which includes a pattern that becomes visible upon scanning and/or photocopying the void pantograph. Typically they spell out "void", "copy", "invalid" or some other indicator message.
![void pantograph image void pantograph image](https://i.stack.imgur.com/zQciu.png)
The void pantograph includes a foreground portion based on a region of an image that is defined using a predetermined filter, and a background portion based on another region of the image that is defined using the predetermined filter. These templates are designed in a CAD program where the positive and the negative are essentially the same size with no compensation for clearance. They're NOT built in the traditional manner where you create a positive and then cast a negative around it. Normally these are invisible to the eye, but become obvious when the document is photocopied. A void pantograph and a method for generating the same are disclosed herein. These pantograph templates are created at a 4:1 ratio. In security printing, void pantograph refers to a method of making copy-evident and tamper-resistant patterns in the background of a document.