Basic question about filters

do deblock, denoise, , such filters prevent artifacts, or remove them? i'm guessing it's former, because if blocky/noisy areas supposed part of video? (that explain why amateurs complain filters don't anything.)

question occurred me when noticed crop options in streamclip - lets apply them either source or destination video... , of course makes huge difference.

 

the prefix "de-" means "remove".

 

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