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Infrared cameras, also known as thermographic cameras, take snapshots by capturing images from the infrared spectrum; in other words, infrared cameras take pictures of heat radiation rather than visible light radiation. When taking an infrared picture, the hottest areas of the image glow white, bright red and orange; the darkest portions are dark blue, purple and blackish. The ability of these cameras to "see" heat signatures makes them useful in a variety of settings.
Emergency Response
Firefighters occasionally employ infrared cameras to look for hard-to-see hotspots through smoke and even through walls. Additionally, police helicopters have been known to use infrared cameras to see fleeing suspects in the dark.
Energy Auditing
Infrared cameras can also be used to locate areas of extreme heat loss in buildings, allowing for better insulating practices and increased energy conservation.
Military Applications
Infrared imaging is commonly used by the military to see enemy combatants in the dark or to locate underground facilities by looking for the heat signatures radiated from such structures.
Artistic Expression
As explained in artist Thom Hogan's web article "Shooting Infrared with CCTV Cameras," infrared cameras can be used to take eclectic artistic images of heat sources.
