pnmtoddif - Convert a PNM image to DDIF format

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.

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

       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.

       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

netpbm documentation                                  2003                              PnmtoddifUserManual(1)

       pnmtoddif - Convert a PNM image to DDIF format

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

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

pnm(1)

pnmtoddif [-resolutionxy] [pnmfile [ddiffile]]