Hi, I don't remember this appearing here, but after some thought on how to reduce fixed noise in long exposure photos (where a lot of the noise is fixed and not random because of effects of additional circuitry and temperature), I found this very interesting article on photo.net exactly about this, reducing fixed/bias noise in sensors.
http://www.photo.net/learn/dark_noise/ I will do some real world trying out, and post the results. Using GIMP or IMAGEMAGICK it could be even easier to automate the process. Good light! fra
