[Matplotlib-users] RuntimeError: _image_module

[Les S. <sch...@op...>]

John Hunter wrote:

> Try installing the latest release (0.83.2),
>  removing your ~/.matplotlib/tex.cache, and rerunning your script.


i still get the problem:


<<<<<<<<<<<<
root@tma-1:~/install/matplotlib-0.83.2/examples# rm -rf 
/root/.matplotlib/tex.cache

root@tma-1:~/install/matplotlib-0.83.2/examples# python2.4 tex_demo.py
Traceback (most recent call last):
  File "tex_demo.py", line 31, in ?
    savefig('tex_demo.ps')
  File "/usr/lib/python2.4/site-packages/pylab.py", line 773, in savefig

  File "/usr/lib/python2.4/site-packages/matplotlib/figure.py", line 
636, in savefig
    self.canvas.print_figure(*args, **kwargs)
  File 
"/usr/lib/python2.4/site-packages/matplotlib/backends/backend_tkagg.py", 
line 179, in print_figure
    agg.print_figure(filename, dpi, facecolor, edgecolor, orientation)
  File 
"/usr/lib/python2.4/site-packages/matplotlib/backends/backend_agg.py", 
line 444, in print_figure
    self.draw()
  File 
"/usr/lib/python2.4/site-packages/matplotlib/backends/backend_agg.py", 
line 381, in draw
    self.figure.draw(renderer)
  File "/usr/lib/python2.4/site-packages/matplotlib/figure.py", line 
511, in draw
    for a in self.axes: a.draw(renderer)
  File "/usr/lib/python2.4/site-packages/matplotlib/axes.py", line 1387, 
in draw
    self.xaxis.draw(renderer)
  File "/usr/lib/python2.4/site-packages/matplotlib/axis.py", line 552, 
in draw
    tick.draw(renderer)
  File "/usr/lib/python2.4/site-packages/matplotlib/axis.py", line 151, 
in draw
    if self.label1On: self.label1.draw(renderer)
  File "/usr/lib/python2.4/site-packages/matplotlib/text.py", line 848, 
in draw
    self._mytext.draw(renderer)
  File "/usr/lib/python2.4/site-packages/matplotlib/text.py", line 335, 
in draw
    bbox, info = self._get_layout(renderer)
  File "/usr/lib/python2.4/site-packages/matplotlib/text.py", line 184, 
in _get_layout
    w,h = renderer.get_text_width_height(
  File 
"/usr/lib/python2.4/site-packages/matplotlib/backends/backend_agg.py", 
line 241, in get_text_width_height
    Z = self.texmanager.get_rgba(s, size, dpi, rgb)
  File "/usr/lib/python2.4/site-packages/matplotlib/texmanager.py", line 
296, in get_rgba
    X = readpng(pngfile)
RuntimeError: _image_module::readpng could not open PNG file 
/root/.matplotlib/tex.cache/30565a8911a6bb487e3745c0ea3c8224_120.png for 
reading

root@tma-1:~/install/matplotlib-0.83.2/examples# ls -l 
/root/.matplotlib/tex.cache/
total 8
-rw-r--r--  1 root root 204 Aug 17 12:51 
30565a8911a6bb487e3745c0ea3c8224.dvi
-rw-r--r--  1 root root 160 Aug 17 12:51 
30565a8911a6bb487e3745c0ea3c8224.tex
 >>>>>>>>>>

the problem -- on the surface -- appears to be that readpng is looking 
for an existing file, but with _120 prepended to the . extension.

les schaffer