pnmtoddif
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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.
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 standard output. It can only specified if a pnmfile is
also specified.
syntax
pnmtoddif pnmtoddif [-resolution x y] [pnmfile [ddiffile]]
author
Burkhard
Neidecker-Lutz
Digital Equipment Corporation, CEC Karlsruhe
neideck[:at:]nestvx.enet.dec[:dot:]com