Tuesday, August 29, 2006

Why Infrared?

I found this nice article about infrared photography, and got hooked.
http://www.cocam.co.uk/CoCamWS/Infrared/INFRARED.HTM#INTRO

Infrared photography uses films that are sensitive to both the light we can see and some of the longer length (above 700 nm) infra-red radiation. The film is also sensitive in the UV region (below 400 nm). In the case of the Kodak HIE film it is sensitive to near-infrared radiation out to approximately 1000 nm wavelength (1 micron). There are scientific uses for such films which include forensic applications and aerial crop and forest surveys. The film is also used in the restoration and investigation of paintings, but here the focus is on expanding our range of picture making media.

Some people just try infrared once as a novelty, others get hooked on the effects and exploit it as their main film, especially Kodak's High Speed Infrared black and white film.
Everything looks odd on colour IR film. The following remarks relate to black and white IR film.

Vegetation and sky look very different from normal therefore incorporating either or both into your pictures will take advantage of the effect of IR film. Vegetation comes out bright, clear sky comes out dark - clouds stay light.

Skin also looks different on IR film (veins are revealed under human skin) which can be used for interesting portraits. Eyes appear black which can look a little menacing, surreal or alien.

Graveyard shots - grass will go almost white leaving the tombstone floating in an eerie space, similarly for standing stones.
Derelict buildings covered in creepers - again the contrast of stone and vegetation. See Pete Schermerhorn's excellent article on castles in Ireland.
People on the beach - sky and skin, water reflecting sky
Nudes in a landscape - skin and vegetation and/or sky
Haze reduction - only reduces blue haze, but try it
Hot houses - vegetation
People with sunglasses - it is sometimes possible to see the eyes behind seemingly opaque sunglasses.
The effect with sunglasses is easily explained: (gradually) grey filters used for normal optics (photofilters, sunglasses) don't have any effect on infrared light; this non-effect is also seen with polaroid filters so polaroid sunglasses appear transparent).

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