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- Created 2012-02-26
tree photographed in the near
same tree in the
visible part of the spectrum
or used is sensitive to
light. The part of the
used is referred to as near-infrared to distinguish it from far-infrared, which is the domain of
s used for
range from about 700
to about 900 nm. Film is usually sensitive to visible light too, so an infrared-passing filter is used; this lets infrared (IR) light pass through to the
, but blocks all or most of the visible light spectrum (the filter thus looks black or deep red). ("Infrared filter" may refer either to this type of filter or to one that blocks infrared but passes other wavelengths.)
are used together with infrared-sensitive film or sensors, very interesting "
s" can be obtained;
images with a dreamlike or sometimes lurid appearance known as the "Wood Effect," an effect mainly caused by
(such as tree leaves and grass) strongly reflecting in the same way visible light is reflected from
. There is a small contribution from chlorophyll
, but this is marginal and is not the real cause of the brightness seen in infrared photographs. The effect is named after the infrared photography pioneer
Robert W. Wood
, and not after the material wood, which does not strongly reflect infrared.
The other attributes of infrared photographs include very dark skies and penetration of atmospheric haze, caused by reduced
, respectively, compared to visible light. The dark skies, in turn, result in less infrared light in shadows and dark reflections of those skies from water, and clouds will stand out strongly. These wavelengths also penetrate a few millimeters into skin and give a milky look to portraits, although eyes often look black.
from Wikipedia (last updated: 25 May), licensed under
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