RAW files are like unprocessed film. The raw processing software you use to edit them is like the film developer.
Camera makers use special noise reduction processing techniques to reduce the appearance of noise in photos, but the drawback is image softness and haziness and a kind of ‘watercolour’ effect where areas of fine, subtle detail are smudged beyond recognition. Bad noise reduction can do as much harm as image noise – or more.
Noise is the digital equivalent of grain in film. It’s random electrical signals captured by the photosites on the camera sensor, and usually this background noise level is so low compared to the brightness of the captured picture itself that you just don’t notice it. But if you start increasing the camera’s ISO setting, the […]