The following test images were retrieved from
ftp://ftp.photodex.com/pub/photodex/PNG/images/ with the permission
of Paul Schmidt of Photodex Corporation:

     248769 Aug 21  1995 bigtut.png
     565817 Apr  5  1996 cpic_eye.png
       3409 Aug 21  1995 cpic_l24.png
    1590334 Aug 21  1995 mom.png
      65063 Aug 21  1995 noise.png
      30012 Aug 21  1995 paul02b.png
       8861 Aug 21  1995 pngtest.png
     352060 Aug 21  1995 skyvas57.png
     453078 Aug 21  1995 sungls.png
     283053 Aug 21  1995 us_earth.png