Kodak High-Speed Infrared film , also known as Kodak HIE , was a popular black-and-white infrared photographic film from Kodak . The film was sensitive to the visible light spectrum (with decreased green sensitivity), infrared radiation up to 900nm in wavelength, and some ultraviolet radiation as well.
10-496: The prominent blooming or "glow" often seen in the highlights of infrared photographs is an artifact of HIE and not of infrared light itself (nor even of all IR-sensitive films). This is because conventional photographic films have an anti-halation layer that absorbs scattered light, while HIE lacks this backing. As a result, Kodak HIE (which also had a completely transparent base, whereas most films have slightly gray bases) had to be loaded and unloaded in total darkness. Light can enter
20-458: Is no longer practical to continue to manufacture given the low volume, the age of the product formulations and the complexity of the processes involved." At the time of this notice, HIE Infrared 135-36 was available at a street price of around $ 12 a roll at US mail order outlets. Despite the discontinuance of HIE, other newer infrared sensitive emulsions from Rollei and Ilford are still available, but have differing sensitivity and specifications from
30-402: Is one of the properties unique to analog film stock and isn't found in digital footage unless modified in post-production . Despite anti-halation backing, most film stock still renders a slight red halo around the brightest elements in a picture, where the incoming light is so strong that it cannot fully be absorbed by the anti-halation backing, and instead is scattered back into the red layer of
40-543: The Eastman Color Negative (ECN2) process for color motion picture film both have steps which remove this layer. The lack of an anti-halation layer in Kodak High-Speed Infrared (HIE) film caused the ethereal "glowing" effect often associated with infrared photography , rather than an artifact of IR itself. This effect is particularly pronounced in motion picture cameras. These cameras are subject to
50-466: The base. Its purpose is to absorb light that passes through the emulsion, thus preventing any light from being reflected back through the emulsion from the rear surface of the base, or from anything behind the film, such as the pressure plate of the camera. This prevents a halo -like effect ( halation ) from forming around bright points or edges in the image. Still cameras, which handle less film and thus contend with less wear, typically hold their film in
60-411: The constant motion of film being dragged through the film gate, so most motion picture cameras have film movements made or plated with wear-resistant alloys such as hard chrome. Given such a relatively reflective pressure plate behind the film, many motion picture films use an anti-halation (and anti-static) backing. Different kinds of effects can be achieved by removing the anti-halation backing. Halation
70-489: The film through the tail protruding from a 35mm canister and without a gray base it will be piped into the film and expose it; without an anti-halation layer any light entering the substrate through the emulsion will be reflected back and forth inside the film, becoming diffuse as it travels and causing halation. Nonetheless, HIE was produced without a gray base and anti-halation layers so that sensitivity would be increased by allowing light to reflect back and forth, and because it
80-482: The gate with components painted or treated to be black, so reflections are less of an issue and few still films made use of anti-halation backings. The notable exception was Kodak's Kodachrome , which incorporated such a backing to aid with a very sensitive innermost layer. The anti-halation layer is rendered transparent or washed out during processing of the film, for example, the K-14 process for Kodachrome still film and
90-408: The long-established HIE. This photography-related article is a stub . You can help Misplaced Pages by expanding it . Anti-halation backing An anti-halation backing is a layer found in many photographic films —and almost all film intended for motion picture cameras—usually a coating on the back of the film base , though it is sometimes incorporated between the light-sensitive emulsion and
100-482: Was difficult to find any way of treating the film that would be effective at infrared wavelengths. HIE featured a polyester film base that was very stable but susceptible to scratches, and therefore required extra care during development, processing and scanning. As of November 2, 2007, "Kodak is preannouncing the discontinuance" of HIE Infrared 35 mm film stating the reasons that, "Demand for these products has been declining significantly in recent years, and it
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