Why do some Blu-rays look better than others?

[dadkins]

Definition of: noise

Distortions in analog and digital video images that are caused by a variety of circumstances. The silver grains in the original film create granular noise. Electronic circuits create Gaussian noise. Drop outs and bit errors in digital tapes create impulse noise, and the digitization process creates quantization noise.

Also:
http://en.wikipedia.org/wiki/Noise#Visual_noise

"Noise is also present in images. Electronic noise will be present in camera sensors, and the physical size of the grains of film emulsion creates visual noise. This kind of noise is referred to as "grain.""


DNR is not Digital Noise Reduction, it is Dynamic Noise Reduction and can reduce the granular noise created by film.