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Originally Posted by Anthony P
you can't use itunes (or any other streaming service) as reference for the physical media.
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True. The problem, none of us know what the source is for a disc or stream. In general, a Blu-ray will be a trim pass of the DCI-P3. A streamer will receive a mezzanine file(s), most likely one of the Apple Pro Res versions. There again, very few will be privy as to the source the mezzanine file(s) were made from.
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Because they are so bit starved grading is definitely something that can easily be a compression artifact and not in the master.
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Over compression should not change the color grading, can it make it look really bad, sure can. Some effects of heavy compression: