RE: [png-mng-implement] Empty PLTE when writing. Howto?

[Bob F. <bfr...@si...>]

On Fri, 2 Sep 2005, John Bowler wrote:

> From: Bob Friesenhahn
>> From looking at the MNG specification, it appears that an empty
>> PLTE is expected here.
>
> IIRC it's not possible to implement the correct handling of unknown chunks
> in a PNG stream if the PLTE is completely omitted - the ordering rules say
> that order wrt the PLTE (before or after) must be preserved.  I believe an
> emtpy PLTE was used as a placeholder in MNG to handle this.

An extra twelve bytes per sub-image have been sacrificed.  While this 
is a difficult cross for me to bear, the final result works great! :-)

Bob
======================================
Bob Friesenhahn
bfr...@si..., http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/