What does Film grain mean?
Film grain is texture associated with photographic film and can also be simulated as an artistic treatment. It is not automatically a sign of a poor stream, although compression can represent it badly.
Why it matters
Grain changes across frames and can be demanding to encode because it adds fine variation. Strong noise reduction may remove it along with skin, fabric and other useful texture. Distinguish intended grain from large blocks, pulsing clumps or excessive electronic noise. Different productions need not share the same clean surface, even when their resolution and codec labels match.
A practical example
An older film can retain visible fine grain in a high-quality transfer. Smoothing every speck may make it look superficially polished while erasing detail. Compare restrained processing in motion and report specific blocks or smearing rather than asking for all texture to be removed.
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Related terminology: File association, Firewall.
For practical setup and troubleshooting, browse the journal or support guides.