Digital image sensors aren’t like classical, chemical sensors which rely on light exposure to a chemical to create an image. Chemical sensors can washout easily, since the chemical will get used up on exposure to light. Digital image sensors digitally store the light/image data in a continuous stream; that means that they can continuously display what the image would be if you took the picture now. It also means that it can discard “old” light/image data that would cause the image to washout. This doesn’t make it perfect, but it’s easier for someone who is unfamiliar with camera settings to take an okay picture.
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