Infrared photography
（重定向自Infra red photography）
![Top: tree photographed in the near infrared range. Bottom: same tree in the visible part of the spectrum.](/Images/godic/202501/20/Tree_example_IR2403.jpg")
![](/Images/godic/202501/20/Tree_example_VIS2403.jpg")
![Infrared image of the Mississippi River crossed by a bridge and a dam, between red foliage on left, and blue parking lots and buildings on right](/Images/godic/202501/20/Minnesota_Lock_and_Dam_1_006-062-02-19942403.jpg")
![Visible vs. Infrared (900 nm LP) Aerial Photography of Old Hickory Lake, Tennessee. Taken from a passenger airplane within seconds apart using SONY H-9 Digital camera.](/Images/godic/202501/20/Visible_Spectrum_vs_IR2403.jpg")
In infrared photography, the film or image sensor used is sensitive to infrared light. The part of the spectrum used is referred to as near-infrared to distinguish it from far-infrared, which is the domain of thermal imaging. Wavelengths used for photography range from about 700 nm 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 camera, 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.)