Some digital cameras take an additional dark frame just before the shot and
subtract it on the fly. You might want to check and make sure yours isn't
one of those. Actually the noise is related to a lot of factors and it
doesn't change as fast as you may think.
Kent Gittings

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Frantisek Vlcek
Sent: Sunday, December 16, 2001 7:00 AM
To: [EMAIL PROTECTED]
Subject: Re: ? PShop darkframe subst


Thanks for explanation!

Guess I will have to use more conventional noise removal techniques,
as I think (as Mark pointed out) the noise would change too much
between the dark shot and normal shot - after all, it's called
"noise", being irregular. I am not sure if it can work very well in
the E20, btw, won't the noise pattern change too much even if they do
it just before exposure? they must be very quick. Colour noise is not
much problem, easy to remove, but what is a problem is luminance
noise, extremely hard to remove without sacrificing detail. I find out
that giving more exposure usually helps, but I used so far my digicam
almost only to get news pictures of a music festival, where of course
lighting wasn't ideal, so I had to use 400 iso anyway. For newspaper,
it was ok fortunately.

Frantisek
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