infrared photography
n.
A technique of recording the portion of the light spectrum between roughly 700 and 900 nanometers, which is not normally visible to the human eye.
Notes
Infrared light is just below the red portion of the spectrum, at the opposite end of the visible spectrum from ultraviolet. Infrared photography commonly captures between 700 and 900 nanometers, but specialized materials may record as low as 1200 nanometers. Depending on the techniques and materials, infrared photography may include a portion of the visible light spectrum.Infrared photographs may represent the amount of radiation in a single color, with variations in shades representing the intensity of the radiation. Infrared photographs may also be made with color materials, using different visible colors to represent different portions of the spectrum; for example, blue might represent infrared, with green and red representing the visible spectrum.
