pnmtoddif(1) - Man pages

Pnmtoddif User Manual(1) General Commands Manual Pnmtoddif User Manual(1)

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 uncom-
pressed. 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 re-
size on most Digital Equipment Corporation color monitors.

OPTIONS
In addition to the options common to all programs based on libnetpbm
(most notably -quiet, see ]8;;index.html#commonoptions\ Common Options]8;;\ ), 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.