PNMTODDIF

Name

      pnmtoddif - Convert a portable anymap to DDIF format

Syntax

      pnmtoddif pnmtoddif [-resolution x y] [pnmfile [ddiffile]]

OPTIONS

      resolution x y The horizontal and vertical resolution of the output
                     image in dots per inch. Defaults to 78 dpi.
      pnmfile        The filename for the image file in pnm format.  If this
                     argument is omitted, input is read from stdin.
      ddiffile       The filename for the image file to be created in DDIF
                     format.  If this argument is omitted, the ddiffile is
                     written to standard output. It can only specified if a
                     pnmfile is also specified.

DESCRIPTION

      pnmtoddif takes a portable anymap from standard input and converts it
      into a DDIF image file on standard output or the specified DDIF file.
      pbm format (bitmap) data is written as 1 bit DDIF, pgm format data
      (greyscale) as 8 bit greyscale DDIF, and ppm format data is written as
      8,8,8 bit color DDIF. All DDIF image files are written as
      uncompressed. The data plane organization is interleaved by pixel.
      In addition to the number of pixels in the width and height dimension,
      DDIF images also carry information about the size that the image
      should have, that is, the physical space that a pixel occupies.
      PBMPLUS images do not carry this information, hence it has to be
      externally supplied.  The default of 78 dpi has the beneficial
      property of not causing a resize on most Digital Equipment Corporation
      color monitors.

AUTHOR

      Burkhard Neidecker-Lutz
      Digital Equipment Corporation, CEC Karlsruhe
      neideck@nestvx.enet.dec.com