However, in a broadcast television bearing on the science fiction, the possibilities to visualize holograms with a computer via Internet (surely like the legendary genius with the lamp of Aladdin…) and to reveal in space a holographic image with like only support of the ionized air (surely like the ghostly appearances in films of George Méliès in George Lucas…) were still announced, most seriously of the world…
It is not interdict to dream, but these ideas cannot interest that certain laymen in optics always remaining in waiting of this hypothetical use of holography to improve their visual communication carried out in monocular vision…
While waiting, the images on the advertizing sites of most ordinary with most coveted still do not allow a perfect exploration of the 3rd dimension of space, the depth, by a free exploratory movement of the observer following the 4th dimension, time, even using the most recent electronic screens become flat.

Moreover, despite everything qualities of this technology with a future of the light whose images will remain optically higher than the synthesized images calculated starting from three co-ordinates per computer, like with the stereoscopic images of the flat-faced screens, Holography was annoyingly relegated to the row of the museums !
And only of small metallized sheets could be reproduced in great number of specimens per stamping to leave only surface holograms.
These “stamped holograms”, used in the field of packing or safety to make more difficult the falsification of a bank card or a banknote, are deprived of this fact of the information of the original hologram contained inside its photosensitive layer, and are looked with difficulty in the illuminant with the white light, because of their effect “rainbow “with their weak opening, and of the parasitic reflections of the ambient light on their metal support.

But fortunately, holography does not stop with the vision limited on the bank cards or banknotes of these small sheets metallized about the square centimetre lacking visual information !
In the continuity of the French inventions of photography and cinematography, which does not wish to differently discover this modern technology of the image, as in the form of an image in 4 dimensions of a hologram not stamped,
- with great angle of vision,
- with large opening,
- without awkward reflections,
- true colors without effect “rainbow “,
- with true relief observing the conditions of the natural vision, without photographs or intermediate synthesized images of the object,
- with space-time high definition for a free exploratory movement of the observers, although this original hologram restored by reflection can be stamped, neither printed, neither faxed, nor digitized or “holotelegraphed” by a set of improved transistors?

Thus, the hologram not stamped, “unprintable and undigitizable”, are appeared as a photosensitive matter inside which optical modifications were caused during the recording starting from the interference rings of two laser beams, one coming directly from the laser, the other indirectly by reflection on the object.
After an in-depth development of the photosensitive matter, the optimal restitution of the hologram is carried out under a pencil of light of a source as specific as a laser and directed according to the same angle of incidence as to the recording.
This light is then diffracted at the time of its passage inside the photosensitive matter developed to form a measurable holographic image according to 4 dimensions of space and time :
1. the Height,
2. the Width,
3. the depth, according to the position in the space of the holographic image of the object compared to its support, with the back for a “virtual” image and with before for a “real” image,
4. the time, according to the duration of exploration of the various aspects of the relief of the image according to the height, the width and the depth by an observer moving.

It is true that with a small holographic image of a few cubic centimeters with plane support and very reduced angle of vision, it is difficult for the observer to have the notion of the fourth dimension of time by not having the possibility of turning largely around, from where its remained name with three dimensions.
However, each point of a holographic support restores in each direction an image of the object which corresponds to a different point of view, for a vision in relief and in time following the changing position of the observer.
While each point of an image of a computer or television, movie screen can restore one point of an image with two dimensions.

Since the first experiments of physics using a concave mirror until this last end of century, one sought all the means of misleading our visual system of most powerful.
Léonard de Vinci said already to chapter 53 of his Treaty on painting: “The painters are in despair while wanting to imitate nature because their paintings lack this relief and of this promptness which the objects have however when one sees them in a mirror… It is impossible that painting, whatever the perfection of the lines, shades, lights and colors, can give the natural relief…”
Before holography, the relief of an image was only one simulation not giving again with the observers their freedom of movement to discover the various aspects of space on various plans as in their direct observation of an object.
While making it possible to record instantaneously and simultaneously to restore starting from an only document the totality from the points of view around an object in 3 dimensions (what is not the case for the holographic stereograms carried out starting from a limited number of photographs or intermediate synthesized images of the object), the image reached its higher degree of perfection while becoming finally in conformity with our direct vision of the space-time.
This supremacy in imagery which brings a free exploratory movement of the observer without the wearing of special glasses around an image in true relief to space-time high definition, thanks to this “memory-screen” which restores all information at the same time, returns consequently to the advertizing medium oldest of the world, posting.
The loop seems to us buckled well as regards visual communication then.

...6/6...