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Scrambled(Encrypted) Image

Scrambled(Encrypted) Image
By means of special software tools : individual information such as the passport number, or the holder's name, is embedded in the photograph of the holder or static information such as a country’s name, is embedded in the background printing of travel documents. This information is invisible to the human eye, as it is printed in "scrambled" format and can only be seen using a decoder lens (a special viewer) or laboratory equipment (scanner or camera with a computer with image processing software). Not to be confused with latent image, nor with tilting effect.





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Anti Scan / Anti Copy Pattern

Anti Scan / Anti Copy Pattern
Printed security features integrated in the background printing to protect against simulation through copying.
The printed images and patterns contain embedded (hidden) information that is invisible to the naked eye under normal inspection conditions but becomes visible or legible, or causes flaws (mistakes) to appear after copying or reproduction with a scanner.
Example:
Orientation- and angle-modulated fine-line structures (SAM = Screen Angle Modulation)


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Photochromic Ink

Photochromic Ink
Photochromic inks change their colour when exposed to UV light. When the UV light source is removed, the colour change stays for a certain time before the colour reverts to its original state. Examples: Estonia: passport, Malta: passport (since November 2000).






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See-trough Register

See-trough Register
Images in accurate front-to-back register. Designs or partial motifs seemingly printed at random on the front and back of the substrate, but which match up perfectly or form a complete motif when viewed by transmitted light. Imperfect register in counterfeits will produce a blurred image when viewed by transmitted light.





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