Re: CALL for DISCUSSION: cOMp/cOMP/coMp/coMP: compression wrapper chunks

GLENN PEHRSON <[email protected]>
Newsgroups gmane.comp.graphics.png.general
Message-ID <[email protected]>
> 
>     On January 29, 2017 at 8:31 PM John Bowler <[email protected]> wrote:
> 
>     On Sun, Jan 29, 2017 at 5:00 PM, Glenn Randers-Pehrson
>     <[email protected]> wrote:
> 
>         > > 
> >             > > > 
> > >             ... A decoder shall discard a cOMp chunk
> > >             containing an unsafe-to-copy original chunk and a cOMP chunk containing
> > >             a safe-to-copy original chunk.
> > > 
> > >         > > 
> >         Shouldn't that say
> > 
> >         ... A PNG editor shall discard a cOMp chunk containing an unsafe-to-copy
> >         original chunk but it may preserve a cOMP chunk contianing a safe-to-copy
> >         original chunk, as explained in Chapters 3.3 and 7.1 of the PNG
> >         specification
> >         (Clause 14.2 of the ISO PNG Specification).
> > 
> >     > 
>     No, it was describing decoder behavior.
> 

D-oh.  I missed the whole point of the sentence.


How about


... A decoder shall discard a cOMp/cOMP chunk when the copy-safe property

bit of the original chunk differs from that of the cOMp/coMP chunk itself.

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