python - Matplotlib plots (pcolormesh and colorbar) shift with respect to their axes when using rasterized=True -


i use matplotlib pcolormesh plots colorbars, apply rasterization plots , colorbars in order reduce file size , save figure pdf file. thereby noticed, after rasterization color-area shifts bit respect axes towards , left, white stripe @ lower , right edge of plot appears. same happens colorbar, found worse: thin colorbars, white stripe obvious , disturbing. there way avoid behaviour of rasterized plots , keep rasterized area @ same place before rasterization?

i tried play around rasterization_zorder , zorder settings. helped bit pcolormesh plots (the lower white stripe disappeared), found no way apply colorbar.

down there simple example 4 plots demonstrating problem. please zoom in pdf file @ lower right edges of plots see mean. 

    import numpy np     import matplotlib.pyplot plt      d = np.arange(100).reshape(10, 10)      myfig = plt.figure(figsize=(5, 5))       '''plot 1, no rasterization'''     ax1 = plt.subplot(221)     plot1 = ax1.pcolormesh(d)     cbar1 = plt.colorbar(plot1)     ax1.set_title("no rasterization", fontsize = 10)      '''plot 2, main plot rasterized, colorbar not'''     ax2 = plt.subplot(222)     plot2 = ax2.pcolormesh(d, rasterized=true)     cbar2 = plt.colorbar(plot2)     ax2.set_title("plot rasterized", fontsize = 10)      '''plot 3, main plot , colorbar rasterized'''     ax3 = plt.subplot(223)     plot3 = ax3.pcolormesh(d, rasterized=true)     cbar3 = plt.colorbar(plot3)     cbar3.solids.set_rasterized(true)  # !!!!!!!!      ax3.set_title("plot , cbar rasterized", fontsize = 10)      '''plot 4, whole axes of main plot , colorbar rasterized, attempt use rasterization_zorder'''     ax4 = plt.subplot(224)     ax4.set_rasterization_zorder(-10)     plot4 = ax4.pcolormesh(d, zorder=-20)     '''colorbarbar gets own axis'''     mpl_toolkits.axes_grid1.inset_locator import inset_axes     ax_cbar4 = inset_axes(ax4,  width="3%", height="100%", loc=6)     ax_cbar4.set_rasterization_zorder(-10)     locator_ax_cbar4 =ax_cbar4.get_axes_locator()     locator_ax_cbar4.set_bbox_to_anchor ((1.0, 0 , 1, 1),  ax4.transaxes)     cbar4=plt.colorbar(plot4, cax=ax_cbar4)      #cbar4.solids.set_rasterization_zorder(-10) # ---> not working      cbar4.solids.set_rasterized(true)      ax4.set_title("axes rasterized , zorder changed", fontsize = 10)       plt.savefig("d:/test_rasterization_3plots.pdf", dpi=150)     print 'pdf file saved'      plt.show()

example

any suggestions appreciated!

this bug fixed someplace between 1.2.0 , 1.2.1 ( maybe one: https://github.com/matplotlib/matplotlib/issues/1085, leave tracking down commit fixed problem exercise reader;) ).

the simplest solution upgrade 1.2.1 or higher.


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