Re: [camera]

From: Jim Wilson <wilsonjh@one.net>

I agree with Bob that the best thing to wish for is a film with the
same sensitivity as the human eye.  I've wished for that a lot.

We have at least two things going on. One is the color balance
of the light on the subject, sunlight being warmer than an overcast 
day.  You can deal with that by things like filters, special films, and 
flash.  None of these are perfect, but they can get the colors back to
the general vicinity.  

The other problem has been called the "ageratum effect."  There
are a few different theories floating around to explain it, but the
one that seems to me to be most likely correct is that some of
the pigments of the anthocyanidin family reflect light on the infrared 
side of the spectrum.  Our eyes don't see this, but the film does, 
and represents it red, mixed in with the blues that are represented
just fine.  In my experience, there are a few irises that are
less susceptible to the problem than others, e.g., Jaybird.  It
could be that it has less of the problem pigments.  This problem 
can't be fixed well with a filter.  As Bob says, the filter then distorts 
all the other colors.  We're left with trying to keep infrared sources
away from the plants, building a film that ignores them, or breeding
those pigments out of the flowers.

I've been taking some digital pics with my Sony Mavica FD-91,
and I think it is some better, but I haven't yet done any controlled
comparisons.  On my web page you can see a few:  
http://w3.one.net/~wilsonjh/sibpics/sibgal.html
The Baby Sister pictures were digital and seem to me to be
accurate color.  Blueberry Fair was digital also, and although
it seems a bit on the purple side, I think that is due mainly to
it being in the sun and unfiltered--it's a good match to what I
remember my eyes seeing that day.  I think the Jaybird done
on chemical film is interesting to see as well.

                             --Jim

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