Xwdtopnm User Manual(0) Xwdtopnm User Manual(0)
xwdtopnm - convert an X11 or X10 window dump file to a PNM image
xwdtopnm [-verbose] [-headerdump] [xwdfile]
This program is part of Netpbm(1).
xwdtopnm reads an X11 or X10 window dump file as input and produces a
PNM image as output. The type of the output image depends on the input
file - if it’s black and white, the output is PBM. If it’s grayscale,
the output is PGM. Otherwise, it’s PPM. The program tells you which
type it is writing.
Using this program, you can convert anything you can display on an X
workstation’s screen into a PNM image. Just display whatever you’re
interested in, run the xwd program to capture the contents of the win-
dow, run it through xwdtopnm, and then use pamcut to select the part
Note that a pseudocolor XWD image (typically what you get when you make
a dump of a pseudocolor X window) has maxval 65535, which means the PNM
file that xwdtopnm generates has maxval 65535. Many older image pro-
cessing programs (that aren’t part of the Netpbm package and don’t use
the Netpbm programming library) don’t know how to handle a PNM image
with maxval greater than 255 (because there are two bytes instead of
one for each sample in the image). So you may want to run the output
of xwdtopnm through pnmdepth before feeding it to one of these old pro-
This option causes xwdtopnm to display handy information about
the input image and the conversion process
This option causes xwdtopnm to display the contents of the X11
header. It has no effect when the input is X10. This option
was new in Netpbm 10.26 (December 2004).
pnmtoxwd(1), pnm(1), xwd man page
Copyright (C) 1989, 1991 by Jef Poskanzer.
netpbm documentation 21 October 2003 Xwdtopnm User Manual(0)
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