Re: Stigmata

[George L Smyth <glsmyth@xxxxxxxxx>]

--- Otto Giesenfeld <otto.giesenfeld@xxxxxxxxxxxx> wrote:
> --On den 20 mars 2000, 15:38 +0800 Karl & Anita Shah-Jenner
> <shahjen@xxxxxxxxxx> wrote:
> 
> > ...
> > and as anyone who has taken a photo
> > across a body of water will attest, water absorbs the wavelengths of IR
> > that IR film records and thus looks dark!
> > 
> 
> Is this really the explanation? If the rendering of a water surface in
> general photography is due to reflections of the sky, then the reason for
> dark water in IR photography might be the dark sky... Anyone knows for sure?

This is due, in part, to the coloration.  The bluer the sky, the darker it will
be rendered, since you are using a red cut filter.  Similarly with water, as it
reflects the sky, the filter will remove much of that coloration, thus
rendering it darker.

george

=====
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http://www2.ari.net/GLSmyth/

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