Excess noise ruins many effects, and if you add sharpening to the image, you’ll make the noise worse. There are denoisers and other ways to deal with noise built into cameras, but as an editor, you’re dealing with footage that’s already recorded, so if the noise is already in the footage, it’s there. The upshot for editors is that when they try to brighten darker footage, it ends up with excess noise, which looks bad and makes it difficult to work with the footage. You generally find the most noise in the darker areas in about the bottom 40% of the brightness waveform. There isn’t much picture information for the sensor and for the internal compressors to resolve. The result is noise. Noise is random information buzzing around in your image, and while you’ll find some at every brightness level, it’s more likely to be found in the darker areas of images because the camera sensor didn’t have much light to work with. A common problem with dark footage is noise.
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