NAME

       pnmtoddif - Convert a PNM image to DDIF format

SYNOPSIS

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

DESCRIPTION

       This program is part of Netpbm(1).

       pnmtoddif takes a PNM image and converts it into a DDIF image file.

       pnmtoddif  writes PBM format (bitmap) data as a 1 bit DDIF, PGM format data (grayscale) as
       an 8 bit grayscale DDIF, and  PPM  format  (color)  data  as  an  8,8,8  bit  color  DDIF.
       pnmtoddif  writes  any  DDIF  image  file  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.  Netpbm images do not carry this information,  hence  you  have  to
       supply  it externally.  The default of 78 dpi has the beneficial property of not causing a
       resize on most Digital Equipment Corporation color monitors.

OPTIONS

       In addition to the options common to all programs based on libnetpbm (most notably -quiet,
       see
        Common  Options  ⟨index.html#commonoptions⟩ ), pnmtoddif recognizes the following command
       line option:

       resolution x y
              The horizontal and vertical resolution of  the  output  image  in  dots  per  inch.
              Default is 78 dpi.

ARGUMENTS

       pnmfile
              The  filename  for  the image file in pnm format.  Default is to read from Standard
              Input.

       ddiffile
              The filename for the image  file  to  be  created  in  DDIF  format.   By  default,
              pnmtoddif writes to Standard Output.

SEE ALSO

       pnm(1)

AUTHOR

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

DOCUMENT SOURCE

       This manual page was generated by the Netpbm tool 'makeman' from HTML source.  The  master
       documentation is at

              http://netpbm.sourceforge.net/doc/pnmtoddif.html