pamtoxvmini, pbmtoybm, pnmtoxwd, xvminitoppm, xwdtopnm, ybmtopbm: add pages (#11406)

pages/common/pnmtoxwd.md

@@ -0,0 +1,16 @@
+# pnmtoxwd
+
+> Convert a PNM file into an X11 window dump file.
+> More information: <https://netpbm.sourceforge.net/doc/pnmtoxwd.html>.
+
+- 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}}`