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

Glenn Randers-Pehrson <[email protected]>
Newsgroups gmane.comp.graphics.png.general
Message-ID <CA+PdXcvARuQ5EZAi8G0RCm=ReeOsGr5qU4U03s8kbtsYLqW+aQ@mail.gmail.com>
On Sun, Jan 1, 2017 at 2:44 PM, John Bowler <
[email protected]> wrote:

>
> On Sun, Jan 1, 2017 at 11:36 AM, Glenn Randers-Pehrson <[email protected]>
> wrote:
>
>> Willem, would you allow a compression byte on the eXIf chunk, then?
>>
>
> I'd vote against that, for the same reason that Willem just stated; I
> don't think it will ever be usable in practice.  Actually I don't think
> cOMp or cOMP would be either; I can achieve the same thing with gzip
> foo.png, I'm just proposing it to avoid complexity in the eXIF chunk.
>

I think that a large fraction of the time, the eXIf chunk will be ignored
or simply copied.  It is no more complex to ignore or copy a compressed
chunk than an uncompressed one, but we are talking about a difference of
tens of kbytes per image.

Glenn

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