----- Original Message -----
From: "Godfrey DiGiorgi"
Subject: Re: Noise reduction
For it to be effective, you need to make the dark frame for
subtraction in-camera as close to the time of exposure as possible in
order to obtain the sensor's state at that moment. Sensor state
varies as a function of temperature, power levels, electrical flux in
the camera, etc. Ideally, you'd want to take the dark frame at the
same moment as the actual exposure... which of course isn't possible.
The only benefit I can see obtaining from doing the dark frame
subtraction in post processing would be the ability to adjust the
subtraction algorithm.
Well, it was a nice idea, anyway.
William Robb
