This isn't a problem in xfig, since xfig doesn't create png files, but
delegates this to fig2dev program, which currently is contained in
package fig2dev and in former versions in transfig package.
I tried this out with current version of the program and wasn't able to
reproduce this problem.
Please try again with a newer version and tell me, weather it works now.
Please also check version number of fig2dev used.
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https://bugs.launchpad.net/bugs/381668
Title:
xfig produces illegal PNG file when exporting as PNG
Status in transfig:
New
Status in transfig package in Ubuntu:
New
Status in xfig package in Ubuntu:
Invalid
Bug description:
Binary package hint: xfig
Summary: Exporting a figure as PNG with xfig produces illegal PNG
file.
Steps to reproduce:
1/ start 'xfig foo.fig' from command line:
$ xfig foo.fig
2/ draw something (it does not matter what you draw)
3/ Export as PNG with: File -> Export
In the export dialog box, select "Language: PNG (Portable Network
Graphic)"
and click "Export" button
4/ observe that xfig has produce file "foo.png" (so far so good)
5/ Now run "optipng" tool from command line with:
$ optipng foo.png
6/ Observe the following error:
$ optipng foo.png
OptiPNG 0.6.2.1: Advanced PNG optimizer.
Copyright (C) 2001-2009 Cosmin Truta.
** Processing: foo.png
Warning: Extraneous data found after IEND
39x39 pixels, 3x8 bits/pixel, RGB
Reducing image to 1 bit/pixel, 2 colors in palette
Recoverable errors found in input. Rerun OptiPNG with the -fix option.
Error: Previous error(s) not fixed
** Status report
1 file(s) have been processed.
1 error(s) have been encountered.
-> the PNG file is illegal. It can be corrected though with "optipng -fix
foo.png".
I'm using xfig as shipped with Ubuntu 9.04 (Jaunty)
$ xfig -v
Xfig 3.2 patchlevel 5 (Protocol 3.2)
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