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Horizontal "Lines" affecting image quality

Photography Asked by MarcoCiafa on May 2, 2021

This is a picture from my computer camera (0.9 MP) of me covering the camera with a black tissue with not much light in the room. I hope you can appreciate the tiny horizontal "lines". I took a photo while covering the camera in order they are easily seen, but they appear all the time. Also, they aren’t static.

I would like to know what phenomenon cause them, if it’s posible to solve it and how. Thanks.

"Lines"

One Answer

It's caused by the camera's [or computer's] auto ISO trying to amplify an almost zero signal to sufficient brightness to become an averagely-bright [mid grey] image. The result is random noise in the resulting signal.

The way to 'fix' it is to hide it by adding more light.

Answered by Tetsujin on May 2, 2021

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