How do Noise Filter and Noise Reduction work?
The Olympus E-System features a unique “noise reduction system” that reduces noise without reducing sharpness or color accuracy. Long exposures (two seconds or longer) or high ISO speeds can cause bright or dark points to appear in digital images, a phenomenon called Fixed Pattern Noise. Olympus Noise Reduction technology cancels this noise by subtracting a black image from the actual taken image (a black image of the same exposure time is taken without opening the shutter), the same solution used in the Olympus E-20N/C-5050 Zoom. Since the camera has to take two exposures of equal time in the Noise Reduction mode, high-speed shooting is not possible. Random noise is another problem that affects digital images when a picture is taken at high ISO speeds in the continuous color/tone part of the image. Noise Filter is an image processing method that reduces this phenomenon, reducing noise between the edges while retaining sharpness by actively checking the image part by part. Noise Filter
