Definition of authenticity using technology HIDE IN VIEW
Unlike classical guilloche-elements, Hide in View technology gives much more possibilities of definition of authenticity. Even at copying usual color images it is not always possible to keep precisely all the shades, therefore first of all it is necessary to pay attention to the color conformity of images. If at scanning and the subsequent printing of vector patterns the thickness of the lines has changed by some micron, it will not be as appreciable as considerably deformed shades of the image using Hide In View technology. The second important factor is image sharpness. At usual copying (scanning, removal of moire, repeated screening and printing) the quality of the image is considerably worsened, fine details disappear, the picture becomes blurred. Further it is necessary to make sure that the way of printing meets the original. The attributes of adulteration will be: the image is printed by a stochastic raster (more often jet printers) or the ordered structure is not simply visible (some kinds of digital printing), the ink shines and is felt to the touch (some kinds of digital printing), halftone dots are much larger and are located less often (there may be various kinds of printing), it is possible to distinguish the geometrical structure of an original raster, but on closer examination the lines will be indistinct and with dim edges (at scanning moire was not removed, at printing the fine stochastic raster or digital printing was used). To receive a better copy other grade of paper may be used. As a rule, the obverse and reverse sides of a sheet of special paper for printers differ. Below are given the examples of the qualitative copies made by the laser printer with the resolution of printing 1200 dpi, and jet printer with the resolution of printing 1440 dpi, the average ruling of an original raster - 133 lpi.
It is possible to eliminate a possibility of falsification with an application of household copying equipment, having applied the inks in printing which are not transmitted through CMYK scale. For example, your image can be spread out into two colors opposite on scale - dark blue and orange. Now add to a dark blue color 30 % of silver ink, and to an orange color- 30 % of bronze ink. To increase the protective effect the iris or the Oryol technologies of printing may be used.
Now make sure that there are smooth transitions from one kind of a raster to another on the ordered structure of a raster, for example: line - dot - rhombus. Only the program MATRIX® allows to carry out smooth transition from one kind of a raster to another on one image, and there will be no strict borders between various kinds of a raster. If the image is color, make sure that the change of a raster occurs on all colors.
In order to be convinced of geometrical distortions of the structure of a raster, it is necessary to apply a simple regular grid of dense thin parallel lines on the image being checked. Having applied such a grid on any other image, you will either see nothing, or monotonous moire all over the surface, and only on the original image in iridescent contour lines the latent image becomes appreciable. If to move a verifying grid slowly over the surface of the original image, the latent image will be shown by different shades. If you are not sure that the pattern meets the original, combine a verifying grid with the kept distortions with the image. Now the appeared lighter and darker contour lines emphasize all discrepancies with the original structure. But it is advisable to start checking with a verifying grid having no distortions.
Hide In View technology allows transferring in a raster of the basic image two additional images located in the same place, but not connected between themselves. Depending on the parameters set at generation of a raster, for the display of two various images either two different verifying films may be used, or the same film revolved through 90 degrees, or a film applied by the reverse side.
Due to Hide in View technology the simplest form printed in black color only gets serious protection against falsification, as this technology eliminates "unpunished" retouching of the original. We will take for example the usual form with an ordinary-looking grey background. There is a serial number and a text entered in hand on the form.
The malefactor has scanned the image with the high resolution in a mode of "semitones" (line art), therefore the tonal conformity of the basic image has worsened at printing, but fine details and original structure of a raster (for color images such variant of scanning is impossible) have been saved. Further he has reversed the order of figures in a serial number, retouched the original inscription, using a blank background of the same document, and has written his own text on top. Externally the document may be very similar to the present, but at the application of a verifying film, the places of a retouch will clearly give out a fake.
At the application of a verifying film having a geometrical structure of the original, moire may appear in those places where the image was changed. As at scanning and the subsequent processing of images the raster as a rule is blurred, in order not to cause some moire at repeated screening, the latent image in most cases will either be absent completely on a fake or instead of it there will be monotonous strips of moire.
The samples of fakes on which it is possible to distinguish the latent pattern fall into the category of "super-fakes", but in this case there is also a set of characteristics distinguishing the original from a copy.
The deformed structure of a raster is in itself a serious protection as no other programs and devices use similar effects. Even having files of original images, the program MATRIX®, and knowing parameters of deformation, it is not possible at times to repeat an original raster. The example of the image screened in program MATRIX® with the use of decorative kinds of a raster, the modification of which is connected to the built - in generator of seed value, is given below. At each subsequent generation of the image in the structure of a raster it will be possible to see the differences from the first variant.