At 10:17 AM -0400 9/24/00, Doris Fang wrote:
On Sat, 23 Sep 2000, Jan Steinman wrote:
This is not something you can do with standard 35mm technology.
So-called "infrared film" is really only sensitive to what is called
near-infrared, which would be many hundreds of degrees hot.
Normal IR film can tell the difference between the heat radiating
from a plant and that of the stone behind it. It can tell the difference
between temps from someone's lips as opposed to their cheeks, Jan.
I don't think this is accurate. It can tell the difference between the
infrared *reflectivity* of lips vs cheeks, but not temperature. If it
were otherwise, the act of hold the camera to your face to take pictures
would pretty much clobber the film, no?
paul
--
Paul Wallich pw@xxxxxxxxx
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