At 06:38 AM 4/5/2007 +0000, you wrote:
>I finally caught up with the APNG/mPNG threads.
I wondered when you would chime in with something like
this.
> Since aHDR and aDAT are invalid in PNG, they are
errors if
> encountered in a PNG datastream.
An ANG-unaware decoder won't know that they are invalid.
> Like any erroneous ancillary
> chunks, decoders should ignore them, and notify the
user if
> appropriate.
It will do whatever it does with unrecognized ancillary
chunks,
usually ignore without comment.
> Putting all the frame data in one chunk avoids the
complication of
> how to deal with reordering by ANG-unaware PNG
editors.
It's a tradeoff between complexity and a potentially
overly-large chunk.
Glenn
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