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<p>
All cameras produce noise, which is shown in the picture below
(click on it to show a larger version where the noise is more apparent).
A theoretical "perfect" camera would produce a pure black image.
<br>
Noise can be one or more of the following:
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<ol class="minimalPadding">
	<li>Pixels that are stuck on and appear white on a mono camera,
		or red, green, or blue on a color camera.
		These are called "hot pixels".
		<br>
		White hot pixels are visibl