What is Digital Image Noise?
Image noise is the digital equivalent of film grain. It manifests as “speckles” in an area of an image that should be of constant color or brightness. In technical terms, it is a (usually undesirable) variation of brightness or color information in images produced with a digital camera sensor. Digital image noise in a magnified image of the sky. © Julie Waterhouse Photography Definition: SNR. The signal-to-noise ratio (SNR) is a way of comparing signal to noise for any electronic unit (including a camera sensor). If you have a high SNR, then image information clearly stands out from any background noise. On the other hand, a low SNR means the signal and noise in the image is similar, and it’s harder to distinguish the image from the noise.
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