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Tree in Infrared: University of Illinois at Urbana-Champaign, Urbana, IL, USA
 
An infrared photograph looking up at the truck of a tree that is wrapped in ivy.
 
 
Tags: infrared

An infrared photograph of a tree. This photograph was taken in March, so there are no leaves on the tree itself. There is ivy on the tree, the leaves of which show up as white.

The camera that I used to to take this photograph was not converted to take infrared photographs. As a result, this photograph took a little over 10 minutes to expose, even though it was taken on a bright and sunny day (10.25 minutes, f/10, ISO 100).

Infrared light it outside the visible light spectrum, and thus invisible to humans. However, digital camera sensors are sensitive to infrared light (varies by camera model and if the camera has been modified or not). A filter that blocks visible light, but allows infrared light to pass through, can be used to take photographs in the infrared spectrum. Infrared photographs are often referred to as "false color image" since the infrared light that reaches the sensor is ultimately viewed as visible light when the resulting photograph is viewed by a human (i.e. the color was previously infrared, but has now been mapped into something visible by humans).