holography

Holography is the science and practice of making holograms. Typically, a hologram is a photographic recording of a light field, rather than of an image formed by a lens, and it is used to display a fully three-dimensional image of the holographed subject, which is seen without the aid of special glasses or other intermediate optics. The hologram itself is not an image and it is usually unintelligible when viewed under diffuse ambient light. It is an encoding of the light field as an interference pattern of seemingly random variations in the opacity, density, or surface profile of the photographic medium. When suitably lit, the interference pattern diffracts the light into a reproduction of the original light field and the objects that were in it appear to still be there, exhibiting visual depth cues such as parallax and perspective that change realistically with any change in the relative position of the observer.

In its pure form, holography requires the use of laser light for illuminating the subject and for viewing the finished hologram. In a side-by-side comparison under optimal conditions, a holographic image is visually indistinguishable from the actual subject, if the hologram and the subject are lit just as they were at the time of recording. A microscopic level of detail throughout the recorded volume of space can be reproduced. In common practice, however, major image quality compromises are made to eliminate the need for laser illumination when viewing the hologram, and sometimes, to the extent possible, also when making it. Holographic portraiture often resorts to a non-holographic intermediate imaging procedure, to avoid the hazardous high-powered pulsed lasers otherwise needed to optically “freeze” living subjects as perfectly as the extremely motion-intolerant holographic recording process requires. Holograms can now also be entirely computer-generated and show objects or scenes that never existed.

Holography should not be confused with lenticular and other earlier autostereoscopic 3D display technologies, which can produce superficially similar results but are based on conventional lens imaging. Stage illusions such as Pepper’s Ghost and other unusual, baffling, or seemingly magical images are also often incorrectly called holograms.

20. May 2019

Lestival

The most beautiful fantasy festival in Slovakia – the Lestival. On the motif of the Mr. Dobšinský Fairy Tale already on 18 May 2019 in the […]
22. November 2018

Festival od Light and Shadow 2018

The Festival of Light and Shadow, a member of the Germany based international association of festivals ECOMOVE International, since last year, has already seen a significant […]
18. November 2018

Holography on Hviezdne noci

The third weekend of August was the 4th year of the Stargate Nights multiplayer festival in Bytča. This small Slovak festival has a completely different concept […]
18. November 2018

About ferryman Jozef

The fifth continuation of the favorite Stories from Trencin tells this time the story of the emperor Jozef. Viewers – the general public could see flying […]
11. July 2017

O opátovi Štefanovi

The fourth continuation of the nightly open air event The Stories from Trenčín on June 30 and July 1, 2017 offers a story about the unusual […]
29. January 2016

Emancipation

On 19 and 20 December, 2015 in the basement Kamper Mansion Archaeological Museum held a presentation of Emancipation (Jozef Holly – 1908). The vision of the […]
25. January 2016

Interactive holography

Interactive holographic display prepared by the civic association composed TRAKT Pavol Soukal and Mgr. art Lukas Matejka in collaboration with the studio Industrial Design Faculty of […]
25. January 2016

Interactivity in art and design

Interactivity in art and design is currently taking shape as a trendy thing. At the invitation MgA. Jakub Hrdina and MgA. Ondrej Puchta of Tomas Bata […]