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Dichroic fog is a type of fogging produced during development, especially when using developers with chemical solvent components. [6] It is evident as an often metallic layer which may appear red or green by reflected or transmitted light and consists of a very thin film of metallic silver redeposited onto the film.
They can be used to help pilots and drivers steer their vehicles at night and in fog, or to detect warm objects against a cooler background. The wavelength of infrared that thermal imaging cameras detect is 3 to 12 μm and differs significantly from that of night vision, which operates in the visible light and near-infrared ranges (0.4 to 1.0 μm).
With some patience and ingenuity, most film cameras can be used. However, some cameras of the 1990s that used 35mm film have infrared sprocket-hole sensors that can fog infrared film (their manuals may warn against the use of infrared film for this reason). Other film cameras are not completely opaque to infrared light.
The gated system uses a pulsed light source and a synchronized camera that enable long ranges (250m) and high performance in rain and snow. Near Infrared wavelength is 0.75–1.4 µm is smaller and can pass between the typical fog particles. Fog particles sizes are typically 10 to 15 microns and ranges is sizes from 1 to 100 microns. [6]
Infrared films may be shot in standard cameras using an infrared pass filters, although focus must compensate for the infrared focal point. A converted digital camera usually requires that the infrared hot mirror be removed and replaced by a wideband, spectrally flat glass of the same optical path length. Typical glass types used include Schott ...
A passive millimeter wave (PMMW) camera is capable of producing a real time video image, with the advantage of seeing through clouds, fog and sand. Use of passive millimeter wave cameras are a promising technology for aircraft based Enhanced Flight Vision Systems as well as ship navigation in low visibility, and industrial applications.
Adding a general overall exposure of light to a photosensitive material to alter the material's response to a captured image is a long-known technique. Photographer Ansel Adams describes the use of "pre-exposure," to make details visible in a darker area of an image, in his text The Negative (rev. ed. 1959). For more, study astronomic ...
In volumetric lighting, the light cone emitted by a light source is modeled as a transparent object and considered as a container of a "volume". As a result, light has the capability to give the effect of passing through an actual three-dimensional aerosol (e.g. fog, dust, smoke, or steam) that is inside its volume, just like in the real world.
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