Re: Photographing trees in autumn with Konica IR

[George L Smyth <GLSmyth@xxxxxxx>]

Chris Eastwood wrote:
> 
> HiYa
> 
> One of my lecturers at Uni was doing IR's of foilage (colour and B&W) for
> the CSIRO in the attempt to detect differences of foilage caused by pest
> attact on the plant.
> 
> He reckoned that even with carefull bracketing and differing development
> (trying to get a gradient) that there was not much to be had ... even with a
> densitometer.

He didn't happen to write an article on that, did he?  If so, I'd
certainly be interested in reading it.

Attempting to do the above would have to be a very difficult task.  The
cell walls within the leaves, as well as the air pockets between the
cells, are the major components in the infrared reflectance.  How pests
might affect this would make for some serious research.  Complicating
the mix is the fact that differing foliage photographs differently. 
This is the sort of thing that has been studied to some degree
("Infra-red photography and plant virus diseases," F. C. Bawden, Nature
magazine 1933 and "Detection of plant disease symptoms by infrared,"  R.
Jackson, Journal of Biol. Phot. Assoc 1964).

george

-- 
 Handmade Photographic Images     
  http://www2.ari.net/glsmyth

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Topic No. 24