Re: Image variants or sets and addressing fragments (fMAP, fcTL, fdAT, aPAL)

In my opinion one of Matthias's comments is particularly wise:

[For anything that's not the web,] private chunks are the way to go.

I wouldn't exclude "anything on the web" either; an independent authority
can standardize a private chunk, just as JEITA standardized an APP marker
for EXIF in JPEG (APP markers in JPEG correspond to PNG private chunks.)

Anyone can create and use a private chunk.  Private chunks can be
publically documented and even if they are not will probably be
reverse-engineered if they come into wide-spread use.

W3C is certainly the body that should be defining web-specific PNG chunks
if and when they are required and, while it might be polite to post a
message here to say this is happening, any debate should happen in the
appropriate W3C forum.

At some point if multiple private chunks exist to define the same
information I can see that this group might need to vote on a public chunk
with a common format but I'm not aware of any case where that been
necessary to date.

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

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