This set of four basic images, each in three sizes, can go in
/pub/png/images .  It demonstrates "interesting" alpha channels,
RGBA-palette quantization (for the quarter-size and half-size
versions), and the reason why we generally don't use truecolor
PNGs for storing photographic images (unless there's an alpha
channel, as in this case, and we want the highest possible
quality).

         43483 Mar 23 18:04 IceAlpha-0.25.png
        134674 Mar 23 18:04 IceAlpha-0.5.png
       1711359 Mar 23 18:07 IceAlpha.png
         65993 Mar 23 18:07 MagnoliaAlpha-0.25.png
        228040 Mar 23 18:07 MagnoliaAlpha-0.5.png
       3369436 Mar 23 18:11 MagnoliaAlpha.png
         60830 Mar 23 18:11 OwlAlpha-0.25.png
        201474 Mar 23 18:11 OwlAlpha-0.5.png
       1795689 Mar 23 18:19 OwlAlpha.png
         35945 Mar 23 18:20 RedbrushAlpha-0.25.png
        115870 Mar 23 18:20 RedbrushAlpha-0.5.png
       1386275 Mar 23 18:22 RedbrushAlpha.png

Images courtesy of Pieter S. van der Meulen.  All of them may be
freely used, copied, modified, etc.  The copyrights are embedded
in text chunks (of course! :-) ).

Greg Roelofs
1999.03.23