::Holography and photo

As holography is closest to a photography, we shall consider in more detail differences of the holographic and photographic images:

The hologram forms the real volumetric image, unlike a photo and even such imitations of volumetric images, as stereograms. The reality is, that the hologram can be observed from different points, observing parts of object or scene, which were hidden from other point of view. In this sense the holographic image behaves completely as real object. It is especially illustrated by the holographic images of transparent objects, for example, the hologram of a lens completely keeps all properties of a real lens, and it is possible to look through the image of a lens the increased images of the objects, located behind it.

But, self-luminous objects, for example, incandescent bulb can not be displayed on the hologram. It follows from the holographic technology - object being holographed should be covered by laser light, and only this light is recorded on the hologram.

The dynamic range of brightness on the hologram is much more higher, than on a photo. On a photo (as by the way in painting), maximal brightness is simply brightness of the unpainted sheet of a paper (or brightness of a white paint). Such limitation is not present on the holographic image, because bright places are formed by light coming from all surface of the hologram. On the paper, image's brightness is formed by subtraction of the maximal brightness, but on the hologram - redirection of light from dark sites to bright. Just it explains a surprising reality of images of transparent subjects, such as glass, water drops, that is those objects, which actually have very large dynamic range of brightness. That to the artists and photographers is given with the large work, because of special receptions, the hologram displays automatically and exactly.

But, unlike photos and pictures, it is necessary a dot light source (lamp) to observe the holograms, in other case image is slightly blurred.

Holography accurately transfers texture of surface of the object. At anyone photographic or polygraphic performance of the image it is impossible to exclude completely influence of texture of the material or painting layer. Even in a qualitative offset printing there is a structure of a surface determined by technology, besides because of presence of mirror reflection on the image the patches of light can be formed or it can be painted by colour of the nearest subjects. The holographic image basically has not the material canvas, as it formed in free space. It determines amazing exact transfer of the texture of a surface of any material.