Repository navigation
PNG output with PGF backend fails with pdftocairo exit code 99 #8121
Description
Bug report
Bug summary
When the PGF backend is selected, saving figures to a PNG image does not work because invoking pdftocairo fails with exit code 99. Saving to a PDF file and then invoking pdftocairo with the same arguments works.
Code for reproduction
# plot_to_png.py
import matplotlib as mpl
mpl.use("pgf")
from matplotlib import pyplot as plt
plt.plot([1, 2, 3], [4, 5, 6])
plt.savefig("test.png")Executing this leads to
me@home:/tmp/mpl » python plot_to_png.py
Traceback (most recent call last):
File "plot_to_png.py", line 6, in <module>
plt.savefig("test.png")
File "/usr/lib/python3.6/site-packages/matplotlib/pyplot.py", line 697, in savefig
res = fig.savefig(*args, **kwargs)
File "/usr/lib/python3.6/site-packages/matplotlib/figure.py", line 1572, in savefig
self.canvas.print_figure(*args, **kwargs)
File "/usr/lib/python3.6/site-packages/matplotlib/backend_bases.py", line 2244, in print_figure
**kwargs)
File "/usr/lib/python3.6/site-packages/matplotlib/backends/backend_pgf.py", line 961, in print_png
self._print_png_to_fh(fh, *args, **kwargs)
File "/usr/lib/python3.6/site-packages/matplotlib/backends/backend_pgf.py", line 941, in _print_png_to_fh
converter(fname_pdf, fname_png, dpi=self.figure.dpi)
File "/usr/lib/python3.6/site-packages/matplotlib/backends/backend_pgf.py", line 197, in cairo_convert
check_output(cmd, shell=True, stderr=subprocess.STDOUT)
File "/usr/lib/python3.6/subprocess.py", line 336, in check_output
**kwargs).stdout
File "/usr/lib/python3.6/subprocess.py", line 418, in run
output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['pdftocairo', '-singlefile', '-png', '-r 100', '/tmp/mpl_pgf_klhh_fnt/figure.pdf', '/tmp/mpl_pgf_klhh_fnt/figure']' returned non-zero exit status 99.
me@home:/tmp/mpl »
Expected outcome
This should produce a PNG file of a linear graph.
Saving to a PDF file and then calling pdftocairo works:
# plot_to_pdf.py
import matplotlib as mpl
mpl.use("pgf")
from matplotlib import pyplot as plt
plt.plot([1, 2, 3], [4, 5, 6])
plt.savefig("test.pdf")me@home:/tmp/mpl » python plot_to_pdf.py
me@home:/tmp/mpl » pdftocairo -singlefile -png -r 100 /tmp/mpl/test.pdf /tmp/mpl/test
me@home:/tmp/mpl » echo $?
0
me@home:/tmp/mpl »
Used program versions
- Arch Linux
-
from the Arch repo
Python 3.6.0 (default, Jan 16 2017, 12:12:55) [GCC 6.3.1 20170109] on linux - Matplotlib version 2.0.0, also installed from Arch repo
- pdftocairo version 0.52.0, also from Arch repo (package is named
poppler)
Prior to updating to Matplotlib 2.0.0 (from 1.5.3) and pdftocairo 0.52.0 (from 0.51.0), this worked.
Activity
QuLogic commentedon Feb 22, 2017
Worked in 1.5.3, so marking critical; also because I've got a fix already written...
pgf: Fix invalid arguments passed to pdftocairo.
dstansby commentedon Feb 24, 2017
This is fixed in 2.0.x
update (#7)