On Wednesday, November 26, 2003, at 06:09 AM, Skip Williams wrote:
Yes, the E-1's in-camera noise reduction option extracts a heavy
burden on the write-to-card time. I'll bet that you can get equal
results from post-camera processing with SOTA tools like NeatImage or
Noise Ninja, which had the best "ratings" on
http://www.michaelalmond.com/Articles/noise.htm.
In camera noise reduction slows down all digital cameras that have it.
Post processing on your computer is not a substitute for it. What the
camera does is that it takes a second dark noise exposure that then
gets subtracted from the long/high ISO image. It exactly matches what
your sensor is doing and takes out hot pixels as well. Some cameras
have heat producing elements near the sensor making long exposure noise
even more uneven. What post processing programs do is make samples of
the image or use a noise curve based on your camera/iso combination and
calculate an average. If there are anomalies or unevenness it will be
missed or if overdone will often give portions of the image that melted
plastic look. Probably the best thing to do is to always use the in
camera long exposure noise reduction and use post processing noise
reduction judiciously.
Winsor
Long Beach, California, USA
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