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Properties are based on.002″/50umHoloGrafix polyester film. Properties of other gauges and finishes of DuraLar polyester film can vary. Phyical Properties But when you look at a developed piece of film used to make a hologram, you don't see anything that looks like the original scene. Instead, you might see a dark frame of film or a random pattern of lines and swirls. Turning this frame of film into an image requires the right illumination. KODAK PROFESSIONAL Technical Pan Film Technical Data Sheet" (PDF). Eastman Kodak Company. Archived (PDF) from the original on 17 August 2000 . Retrieved 13 August 2015.
The holograms you can buy as novelties or see on your driver's license are reflection holograms. These are usually mass-produced using a stamping method. When you develop a holographic emulsion, the surface of the emulsion collapses as the silver halide grains are reduced to pure silver. This changes the texture of the emulsion's surface. This may sound far-fetched, but you encounter this phenomenon every day. Every time you look in a mirror, you see yourself and the surroundings behind you as though they were on the other side of the mirror's surface. But the light rays that make this image aren't on the other side of the mirror — they're the ones that bounce off of the mirror's surface and reach your eyes. Most holograms also act like color filters, so you see the object as the same color as the laser used in its creation rather than its natural color.Film remained the dominant form of photography until the early 21st century, when advances in digital photography drew consumers to digital formats. The first consumer electronic camera, the Sony Mavica was released in 1981, the first digital camera, the Fuji DS-X released in 1989, [50] coupled with advances in software such as Adobe Photoshop which was released in 1989, improvements in consumer level digital color printers and increasingly widespread computers in households during the late 20th century facilitated uptake of digital photography by consumers. [10] Krakow, Gary. "How to Make Holograms at Home." MSNBC. 5/6/2005 (4/9/2007) http://www.msnbc.msn.com/id/7759505/ The first flexible photographic roll film was sold by George Eastman in 1885, [43] but this original "film" was actually a coating on a paper base. As part of the processing, the image-bearing layer was stripped from the paper and attached to a sheet of hardened clear gelatin. The first transparent plastic roll film followed in 1889. [44] It was made from highly flammable cellulose nitrate film. Spectratek’s 100,000 square feet facility can manufacture more high-quality holographic film than any other plant in the world. Proudly manufacturing in the USA for over 40 years, Spectratek provides the highest quality films to meet your global demands. Most films are affected by the physics of silver grain activation (which sets a minimum amount of light required to expose a single grain) and by the statistics of random grain activation by photons. The film requires a minimum amount of light before it begins to expose, and then responds by progressive darkening over a wide dynamic range of exposure until all of the grains are exposed, and the film achieves (after development) its maximum optical density.
Graham, Marty. "Fake Holograms a 3-D Crime Wave." Wired. 2/7/2007. (4/9/2007) http://www.wired.com/science/discoveries/news/2007/02/72664#A light field is generally the result of a light source scattered off objects. Holography can be thought of as somewhat similar to sound recording, whereby a sound field created by vibrating matter like musical instruments or vocal cords, is encoded in such a way that it can be reproduced later, without the presence of the original vibrating matter. [15] However, it is even more similar to Ambisonic sound recording in which any listening angle of a sound field can be reproduced in the reproduction. A film with a particular ISO rating can be push-processed, or "pushed", to behave like a film with a higher ISO, by developing for a longer amount of time or at a higher temperature than usual. [29] :160 More rarely, a film can be "pulled" to behave like a "slower" film. Pushing generally coarsens grain and increases contrast, reducing dynamic range, to the detriment of overall quality. Nevertheless, it can be a useful tradeoff in difficult shooting environments, if the alternative is no usable shot at all. The progression of lens design for later emulsions is of practical importance when considering the use of old lenses, still often used on large-format equipment; a lens designed for orthochromatic film may have visible defects with a color emulsion; a lens for panchromatic film will be better but not as good as later designs. A simple hologram can be made by superimposing two plane waves from the same light source on a holographic recording medium. The two waves interfere, giving a straight-line fringe pattern whose intensity varies sinusoidally across the medium. The spacing of the fringe pattern is determined by the angle between the two waves, and by the wavelength of the light. Find sources: "Photographic film"– news · newspapers · books · scholar · JSTOR ( June 2020) ( Learn how and when to remove this template message)
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