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Re: [OM] More E-1 stuff... (now Noise Reduction)

Subject: Re: [OM] More E-1 stuff... (now Noise Reduction)
From: Winsor Crosby <wincros@xxxxxxxxxxx>
Date: Wed, 26 Nov 2003 13:26:46 -0800

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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