Capture One Raw Processing (6.3)
On a sensor like the Olympus E-P3, it is very sensitive to long exposure noise, but not only is it sensitive to that specific kind of noise it's also sensitive to something far worse, hot pixel noise.
|Crop of full image: Red, Green, Blue spots everywhere. Hot spots throughout as well.|
|All long exposure noise and hot pixel noise are gone.|
|Olympus E-P3, 25mm, F/8, 15 sec|
|Olympus E-P3, 25mm, F/8.0, 20 sec|
One of the programs that was not mentioned was DxO Optics. At this time, RAW support for the E-P3 is not available, but conversion to a TIFF file allows me to attempt to correct the noise. Unfortunately, like the other Noise Reduction only programs it did not remove the noise satisfactory or completely. Anything higher lost too much detail and even at the highest settings there was still a fair amount of spots left behind. I'm a huge advocate of DxO Optics and certain a forthcoming update will improve things, but at this point, Capture One is the only one that works with a file this damaged.
|DxO Optics with settings before too much detail loss (L:12 C:167)|