Re: backround colors with HIE

[Clive Warren <Clive.Warren@xxxxxxxxxxxxxx>]

At 10:41 pm -0400 26/4/01, . . wrote:
>
>If I want a black backround with HIE will any blue backround render 
>black on my image, or is it the reflectance of the particular 
>product such as cotton, nylon, etc?


It is the material which is important rather than the colour.  IR 
reflectance of pure materials can be predicted, however most 
materials are blends of different materials.

I have a black bag which appears to made of the same material 
throughout. The bag side panels are highly IR relective and appear 
white, the strap is not refelctive and appears black.

The safest way to ensure you have a black background is to test 
either using IR film or an IR capable digital camcorder or camera.

-- 
All the best,

              Clive   http://www.cocam.co.uk
                      Photographic Services, Filters and Equipment, Infrared FAQ
			http://www.f32.net
			Large Format Travel and Stock Photography
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