Re: [PNG] Upcoming meeting topics

>PNG decoder which understands cHRM as unsigned will see a huge number for
ACES AP0.

No it won't.  The maximum PNG unsigned value is 0x7FFFFFFF.  All the PNG
32-bit **signed** values are encoded with bit sequences outside this range
and are therefore rejected as invalid.  All **valid** PNG unsigned values
are **also** **valid** signed values positive values and all the the
unsigned values have exactly the same 32-bit (4-byte) representation as the
identical PNG signed values.

All the 32-bit sequences which correspond to negative PNG signed values are
invalid PNG 32-bit **unsigned** encodings.

I did say all of this above!

I'm simply pointing out that the "dead" space in the PNG 32-bit encoding of
PNG unsigned values (which currently results in the cHRM chunk being
rejected if used) can simply be used to fix this serious defect in the PNG
specification.

So nothing gets broken.  I did say this above.  I made both these points in
what I wrote.