Python matplotlib和libpng不兼容问题

Question

我真的很痛苦这个问题.
最初,在使用matplotlib绘制内容后,我可以轻松保存图像.
但是,安装scipy之后,我再也无法保存我的图像了.
(我使用pip安装了matplot和scipy.)
我试图查找一些信息,但我仍然无法解决问题.
我的操作系统是Mac OS X Lion(10.7)

我认为以下链接是一些相关问题

https://github.com/ipython/ipython/issues/2710
Matplotlib python savefig运行时错误python 3.2.3
matplotlib和libpng问题ipython notebook
libpng15静态链接问题

看来如果我可以重新链接库或设置DYLD_LIBRARY_PATH(实际上我不知道那是什么......)

或许我必须重新编译一些东西？
顺便说一下,我对基于linux的系统很新,所以如果有人能以一种相对简单的方式解释它,那将是非常好的.非常感谢你.

以下是一些错误消息:

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

Answer 1

如果您保存JPG,则不需要PNG支持.PIL也不需要:

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()