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Denoising generally removes signal too. Removing noise and reconstituting similar noise to maintain the apparent qualities of an input can help compression, but
by Scaevolus 1y ago
Denoising generally removes signal too. Removing noise and reconstituting similar noise to maintain the apparent qualities of an input can help compression, but you are also cutting out true details (typically fine detail).
The effect GP is pointing out is how denoisers damage detail, which is true. This detail can persist over multiple frames, which is why many denoisers include a temporal comparison component to mitigate the damage, but you still lose detail.
- arghwhat 1y agoDefinitely, but that's a result of compressing (with any algorithm) past a bitrate that would allow detail to be retained with high frequency details including noise being the first to go, not the result of noise having signal as was stated and more importantly unrelated to film grain synthesis which is about adding something new on the output side.