Photography

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A place to politely discuss the tools, technique and culture of photography.

This is not a good place to simply share cool photos/videos or promote your own work and projects, but rather a place to discuss photography as an art and post things that would be of interest to other photographers.

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Where does noise really come from? (alien.top)

submitted 2 years ago by VexTheMaster@alien.top to c/photography@viewfinder.pro

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I know, I know, it can be caused by various factors, like high ISO, poor lighting conditions, long exposure time, heat. (not that I know why the last two cause noise)

But where does noise REALLY come from? What is noise? What does it have to do with photons and photosites?

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[–] VapingLawrence@alien.top 1 points 2 years ago (6 children)

Noise is just miniscule variations caused by myriad of factors - heat, humidity, different amount of photons, properties of different electronic components, natural backround radiation etc. etc. etc...

And no.... high ISO doesn't cause noise, it just amplifies it.

[–] oldlurker114@alien.top 1 points 2 years ago (1 children)

And no.... high ISO doesn't cause noise, it just amplifies it.

No it doesn't.

ISO setting is a lightness parameter. Adjusting it ajusts JPG lightnesss. This is very different from amplifying noise.

Regarding raw files and the underlaying information, the sensor tries to capture - using a high ISO does not amplify noise. Instead it on typical camera slightly reduces the little noise that the analogue to digital convenrsion adds, and some cases also reduces the noise that the pixel adds.

[–] VapingLawrence@alien.top 1 points 2 years ago

I appreciate your input, but instead of misinterpreting Wikipedia articles you should learn how electronics actually work. :)

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