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.
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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