At 11:59 AM 15/07/2005 , William Robb wrote: >I have noted that in long exposures, I get consistent pattern of hot pixels. >It's not randomly generated noise, it's the same from frame to frame. >Anyway, it's something that is easily tried, at some point, when I have the >time, I'll see if I can make anything of it and report back.
I've done it with my 990, even had a little utility, which I can't find, that automated the process. The more similar to the image the dark frame is the better it works. A generic dark frame of approximately the same exposure will do about a 90% noise correction. Exposure time, light level, camera temperature, number of recent exposures effect ccd noise. Powell Hargrave Nanaimo, B.C. Canada Digital Imaging http://members.shaw.ca/hargravep
