pnmtoxwd
Convert a PNM file into an X11 window dump file.
TLDR
Convert a PNM image file to XWD
$ pnmtoxwd [path/to/input_file.pnm] > [path/to/output_file.xwd]
Produce the output in the DirectColor format
$ pnmtoxwd -directcolor [path/to/input_file.pnm] > [path/to/output_file.xwd]
Set the color depth of the output to b bits
$ pnmtoxwd -pseudodepth [b] [path/to/input_file.pnm] > [path/to/output_file.xwd]
