pnmtoddif(1)						      General Commands Manual						      pnmtoddif(1)

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 stan-
		      dard 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

																      pnmtoddif(1)