How Is Noise Created?

12 years 11 months ago #63601 by Britt340
Well, most of us know that when you increase the ISO, you get more noise. I was wondering, why does this actually happen?


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12 years 11 months ago #63611 by Martini
when a signal is created from a sensor pixel, then there is always noise.

This noise depends on the pixel, on its temperature and whatever.


If we now have a weak signal since there is not much light, then we have a bad signal to noise ratio (relatively small signal, but lots of noise). If we have more light, then that ratio becomes better, since the signal increases but the noise remains more or less the same.

If we now increase the ISO, this only means that we amplify more, hence both signal and noise are amplified. With a bad signal to noise ratio we need to amplify more (higher ISO) to get the same signal strength. But more amplification then means more noise since the signal to noise ration remains the same.


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12 years 11 months ago #63655 by chasrich
:agree: You hit the ground running Martini. :welcomeclan :goodpost:

“Amateurs worry about equipment, professionals worry about money, masters worry about light, I just make pictures… ” ~ Vernon Trent
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12 years 11 months ago - 12 years 11 months ago #63831 by Joves
Nice post Martini. The simplistic way to look at it is like your cars speakers, when you increase the volume too much the speakers will crackle or distort the sound, the same applies to light.


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