Re: general questions about IR

[George L Smyth <glsmyth@xxxxxxxxx>]

--- Dirk Wright <wright@xxxxxxxxxxxx> wrote:
> 
> I'm not suggesting that materials that absorb IR are hotter at the time 
> the picture is taken, or that the film is recording temperature. I know 
> that IR film does not record temperature. I am asking that if a 
> material absorbs IR, as shown by the film as being "not red" in EIR or 
> black in HIE, that it will behave in such a way as to be hotter in 
> temperature as compared to materials that reflect IR given that each is 
> exposed to the same amount if IR light. From experience, I can tell you 
> that materials like brick, gravel, asphalt, etc. are much hotter to the 
> touch than any living plant material in full sun. Even a thin sheet of 
> metal the same mass as a leaf will be hotter to the touch in the same 
> light. 

There is an explanation to be found at
http://members.home.net/hmpi/Infrared/Articles/Rethink/rethink.htm.  Although
these materials will be hotter, they will not be recorded any differently - at
least until they enter the hot-object range.

Cheers -

george

=====
Handmade Photographic Images
http://members.home.net/hmpi/

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