* Make the PNG encoder always rebuild the palette, to avoid losing
transparency when it is out of sync with the pixel data (reference
http://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=17655).
+ Eliminated CompressColormapTransFirst() since the palette is already
+ compressed and sorted by opacty now when it's recreated.
2010-12-10 6.6.6-5 Cristy <quetzlzacatenango@image...>
* Account for virtual canvas for the -flip / -flop options (reference