     wide use in the image processing community.  It does not
      support compression or colormaps, but it does support binary,
      grayscale and rgb images.  Like BMP, the implementation
      is simple and requires no external libraries.  See pnmio.c.

    - WEBP is a new wavelet encoding method derived from libvpx,
      a video compression library.  It is rapidly growing in acceptance,
      and is supported natively in several browsers.  Leptonica provides
      an interface through webp into the u