/* begin *

   libpng16 1.6.37 (Portable Network Graphics library)

   PNG (Portable Network Graphics) is an extensible file format for the
   lossless, portable, well-compressed storage of raster images.  PNG
   provides a patent-free replacement for GIF and can also replace many
   common uses of TIFF.  Indexed-color, grayscale, and truecolor images
   are supported, plus an optional alpha channel.  Sample depths range
   from 1 to 16 bits.



 * end */