[Bug 1379480] Re: xwdtopnm generates bad pnm files

[linuxball]

It is sad but true: More than two years later in netpbm (2:10.0-15.3) of
Ubuntu 16.04.1 LTS the bug is still not fixed :-(

Fortunately, there is another tool set (ImageMagick) which has a working
conversion tool (convert). So one can convert xwd output to file.png by
executing:

xwd -root -display :0 | convert xwd:- file.png

I attached file "test.xwd" which shows the bug of xwdtopnm

** Attachment added: "This XWD Screen dump of my display shows xwdtopnm bug"
   https://bugs.launchpad.net/ubuntu/+source/netpbm-free/+bug/1379480/+attachment/4806300/+files/test.xwd

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https://bugs.launchpad.net/bugs/1379480

Title:
  xwdtopnm generates bad pnm files

Status in netpbm-free package in Ubuntu:
  New

Bug description:
  I'm trying to capture the screen to a png file, with the following
  command:

  xwd -root -display :0 | xwdtopnm | pnmtopng > file.png

  The output file is a valid png file, but it's a garbled picture.

  By doing the following diagnostic steps, xwdtopnm was determined to be
  the problem:

  xwd -root -display :0 > test.xwd ; gimp test.xwd   ===> picture looks good
  xwdtopnm < test.xwd > test.pnm  ; gimp test.pnm ===> gimp reports "PNM Image Message: Unsupported maximum value."
  pnmtopng < test.pnm > test.png ; gimp test.png ===> gimp loads a garbled picture

  file test.xwd  ===> file.xwd: XWD X Window Dump image data, "xwdump",
  3840x1080x24

  pnmtoxwd < test.pnm > test2.xwd ; gimp test2.xwd  ===> gimp loads a
  garbled picture

  Hopefully you can fix the glitch in xwdtopnm easily!

  Thanks!

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: netpbm 2:10.0-15
  ProcVersionSignature: Ubuntu 3.8.0-44.66~precise1-generic 3.8.13.25
  Uname: Linux 3.8.0-44-generic x86_64
  ApportVersion: 2.0.1-0ubuntu17.7
  Architecture: amd64
  Date: Thu Oct  9 11:51:37 2014
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   SHELL=/bin/bash
  SourcePackage: netpbm-free
  UpgradeStatus: No upgrade log present (probably fresh install)

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