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Its just common sense that if JPEG used the same algorithms that it would
conform to CCIR 601 specs and it doesn't. In fact the sampling is different,
and there are algorithms to prevent rounding errors seen as artifcats, which
are necessary when compression is used for moving images, which JPEG doesn't
incorporate. And to prove the point, the proposed standard by JPEG ISO/CCITT is
for stills only.
>> The three various values of subsampling for JPEG exist because there are
different things people do with JPEG. <<
You really went out on a limb on this one. The three levels of processing I
mentioned were specifically proposed for Television by the same committee.
Its obvious you understand the concept, its in the details of how its being
implemented for Television that the gaps exist. You might want to call the
United States Advaned Television Test Center, in Alexandria VA. It would be
better than hashing it over on the forum. In other words I decline to debate it
with you, as the information is readily available if you or anyone else wants
it.
John