Infrared photography manipulates the camera’s sensor in order to only display infrared and near-infrared that the human eye can not normally see. The effect caused by this process can vary, but creates a distinct, signature style. This style is normally achieved in one of two ways, either with a filter that only allows infrared light into the camera, or by directly, and irreversibility, altering the filter on the sensor of a DSLR camera. The other part of the process is to use long exposures, which allows the camera to really pick up the infrared light, and then the infrared light is pulled into the visible spectrum by editing the RAW file in Photoshop.
Although infrared photography isn’t new by any means it has been expanded upon. Originally infrared photography was taken from very far away, usually it was used to take aerial photographs of cities, however; with new technology photographers can now use this technique up close, without the need of a helicopter or plane.
A development of this new up close infrared technique has been used to explore taking more than just landscape shots, and has been experimented with in taking portrait photographs.
The conversion process of creating a infrared camera, as stated earlier, is irreversible. This is because it requires the removal of a filter that the sensor uses to cut down infrared light. That is why these scenes look so odd to us, this is what the camera sees without the filter.
The process of conversion of a camera and the technique is explained briefly in this video; http://fast.wistia.net/embed/iframe/cefdxgkmuk?popover=true
Adam K. Smith