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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 omit-
ted, input is read from stdin.
ddiffile The filename for the image file to be created in DDIF format. If this ar-
gument 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 AT nestvx.com
pnmtoddif(1)
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On Apache
Under GNU General Public License
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