Reputation: 2009
I'm really suffering from this problem for so long.
Originally, after plotting something with matplotlib, I could easily save the image.
However, after installing scipy, I couldn't save my image anymore.
(I installed matplot and scipy by using pip.)
I tried to look up some information, but I still can't solve the problem.
My operating system is Mac OS X Lion (10.7)
I think the following links are some relevant issues
https://github.com/ipython/ipython/issues/2710
Matplotlib pylab savefig runtime error in python 3.2.3
matplotlib and libpng issues with ipython notebook
libpng15 static link issues
It seems that if I can relink the libraries or set DYLD_LIBRARY_PATH (actually I don't know what that is...)
Or maybe I have to recompile something?
By the way, I'm very new to linux-based system, so it would be really nice if someone could explain it in a relatively simple way.
Thank you very much.
Below are some error messages:
libpng warning: Application was compiled with png.h from libpng-1.5.4
libpng warning: Application is running with png.c from libpng-1.4.10
libpng warning: Incompatible libpng version in application and library
---------------------------------------------------------------------------
RuntimeError Traceback (most recent call last)
/Library/Python/2.7/site-packages/matplotlib/backends/backend_macosx.pyc in save_figure(self, *args)
476 if filename is None: # Cancel
477 return
--> 478 self.canvas.print_figure(filename)
479
480 def prepare_configure_subplots(self):
/Library/Python/2.7/site-packages/matplotlib/backend_bases.pyc in print_figure(self, filename, dpi, facecolor, edgecolor, orientation, format, **kwargs)
2094 orientation=orientation,
2095 bbox_inches_restore=_bbox_inches_restore,
-> 2096 **kwargs)
2097 finally:
2098 if bbox_inches and restore_bbox:
/Library/Python/2.7/site-packages/matplotlib/backend_bases.pyc in print_png(self, *args, **kwargs)
1856 from backends.backend_agg import FigureCanvasAgg # lazy import
1857 agg = self.switch_backends(FigureCanvasAgg)
-> 1858 return agg.print_png(*args, **kwargs)
1859
1860 def print_ps(self, *args, **kwargs):
/Library/Python/2.7/site-packages/matplotlib/backends/backend_agg.pyc in print_png(self, filename_or_obj, *args, **kwargs)
502 _png.write_png(renderer._renderer.buffer_rgba(),
503 renderer.width, renderer.height,
--> 504 filename_or_obj, self.figure.dpi)
505 finally:
506 if close:
RuntimeError: Could not create write struct
Upvotes: 2
Views: 4917
Reputation: 12152
If you save a JPG you don't need PNG support. There is no need for PIL either:
import pylab as pl
pl.plot([0.2,0.3,0.4], [0.1,0.2,0.3], label='series name')
pl.xlabel('x label')
pl.ylabel('y label')
pl.ylim([0.0, 1.0])
pl.xlim([0.0, 1.0])
pl.title('Title')
pl.legend(loc="lower left")
pl.savefig('output.jpg')
pl.show()
Upvotes: 7