So, instead of an audible hum, the noise presents as speckles on your image. This amplifies the digital signal from your sensor. The same thing happens with your pictures as you turn up the ISO. Turn up your hi-fi to its loudest volume with no music playing, and you should hear a similar humming.
So, here's a simplified explanation.ĭo you remember the scene in Back to the Future where Marty McFly plugs his guitar into an enormous amplifier and turns the volume all the way up? As he does, the background hum gets louder.
I am aware that some readers are new to photography and may not know what digital noise is and what causes it. The graininess seen in this heavily cropped image is the result of a high ISO and a long exposure.
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