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The same is true for how long the image sensor is exposing for, with longer exposures introducing 'heat-soak' noise whereby the photosites (pixels) record their own interference, or that of nearby circuitry. Typically though, the smaller an image sensor is, the more noise will affect a photograph. It can appear as differences in colour or brightness and there are multiple, complicated reasons for its existence. Image noise is generally seen as small, grain-like artefacts that appear like a rash on a digital image.
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