|
|
|
| Home » Infrared Camera » Photography |
|
Infrared Photography |
|
|
In Infrared photography is the film or image sensor used is sensitive to infrared light. The part of the spectrum, which is used, is known as the near infrared to distinguish it from far infrared, which is the field of thermal imaging. The wavelengths usually used for photography range from about 700 nm to about 900 nm. More often than not an "infrared filter" is used and this lets Infrared Radiation light pass through to the camera but blocks all or most of the visible light spectrum and thus it looks black or deep red. When these filters are used together in the Infrared photography with infrared-sensitive film or sensors, very interesting "in-camera effects" can be obtained; false-color or black-and-white images with a dreamlike or sometimes lurid appearance known as the "Wood Effect."
|
|
The effect of Infrared photography is mainly caused by foliage such as tree leaves and grass strongly reflecting in the same way visible light is reflected from snow. Chlorophyll is transparent at these wavelengths and so does not block this reflectance. There is a small contribution from chlorophyll fluorescence also, but this is tremendously small and is not the real cause of the brightness seen in Infrared photographs. The other attributes of Infrared photographs comprise very dark skies and penetration of atmospheric haze, caused by reduced Rayleigh scattering and Mie scattering respectively in the atmosphere compared to visible light. The dark skies, in turn, results in less infrared light in shadows and dark reflections of those skies from water, and clouds will stand out strongly. These wavelengths also break in a few millimeters into skin and give a milky look to portraits, although eyes often look black.
Infrared photography became quite popular with a number of 1960s recording artists, for the reason that, the unusual results; Jimi Hendrix, Donovan, Frank Zappa and the Grateful Dead all issued albums with infrared cover photos. The unexpected colors and effects that infrared film can create fit well with the psychadelic aesthetic that emerged in the late 1960s. Infrared photography can easily look gimmicky, but photographers such as Elio Ciol have made subtle use of black-and-white infrared-sensitive films that is it is spectacular.
Infrared negatives fogged by the frame counter of a Minolta Maxxum 4. Many conventional cameras can be used for Infrared photography, where infrared is taken to mean light of a wavelength only somewhat longer than that of visible light. Photography of rather longer wavelengths is normally termed thermography and needs special equipment. With some patience and cleverness, most film cameras can be used. Nevertheless, some cameras of the 1990s that used 35mm film have infrared sprocket-hole sensors that can fog infrared film. Other film cameras are not totally opaque to infrared light. Satellite sensors and thermographic cameras are mainly sensitive to longer wavelengths of infrared, and use a variety of technologies, which may not resemble common camera or filter designs. Especially, they often need cooling, since at these wavelengths, and room temperature, all objects including the camera body, the optics, and the detector itself are glowing all the time.
Find out more such detailed information on the web page Infrared
|
|
|
| |
|
|
