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

John Bowler <[email protected]>
Newsgroups gmane.comp.graphics.png.general
Message-ID <CAP7U39-xiwOYDdGOYxu2c+S5FG49hfC2VS+Jy0qnmLzzkUkWGg@mail.gmail.com>
On Sun, Jan 1, 2017 at 10:19 AM, Glenn Randers-Pehrson <[email protected]>
wrote:

> Of course, consistency would also suggest having a keyword, which I happen
> to like.  Simple
> handles can be useful.
>

What I'm proposing is a set of chunks which the application never sees; if
I ask the encoder will write an sPLT as cOMP/sPLT but I never seer that; I
give the encoder an sPLT.  When an app reads this using a decoder which
supports cOMP the decoder reports an sPLT, not a cOMP.

If the compressed chunk had a keyword before compression it has one after
compression.  Any extra data on the wrapper cOMP chunk is spurious noise.

-- 
John Bowler <[email protected]>
+1 (541) 450-9885
PO BOX 3151
KERBY OR 97531-3151
USA

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