Re: cOMp chunk [was: EXIF support in PNG]

Glenn has made a number of off-thread proposals about "comp" plus the
on-thread one of moving the compression byte.  I don't see any merit
in these.  In particular the suggestion to add a keyword reveals a
complete misunderstanding of the merits of the chunk.  I do accept the
comments about the chunk not being useful because no one will
implement it so it will never be used (basically Willem's observation
about zTXt).

I had dropped the idea, nevertheless Glenn seems to have suddenly
become enthusiastic about voting on it.

Notice that the discussion was dropped for more than two weeks so
there *isn't* a comp chunk up for discussion if the new voting rules
are approved.

All the same, I will post a formal CFD for discussion, in the
(unapproved) approved format.  It will be the same as the original one
with some explanation to make it more clear why I actually suggested
it in the first place.

John Bowler

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