Re: [Matplotlib-users] imshow for .png- low resultion

[Eric Firing]

On 2014/03/05 11:37 AM, Asma Riyaz wrote:
>   Sorry I somehow forgot to paste the imshow call to plot the .png
> image(pasted the entire code again), I am trying the different
> interpolation parameters in the mean time as suggested by Pierre
>
> data=np.array(full_len)
>      cmap = mpl.cm.hot
>      if outlier==0:
>         threshold=1
>      else:
>         threshold=outlier-0.01
>
>      fig = plt.figure(figsize=(25,25))
>      plt.suptitle(file_handle.replace('.csv',''),fontsize=22)
>      cmap.set_over('green')
>      cmap.set_under('grey')
>      gs=gridspec.GridSpec(1, 2,height_ratios=[1,1,-2,2]
> ,width_ratios=[1,1,-2,2])
>      gs.tight_layout(fig,)
>      phyl_ax=plt.subplot(gs[0]) ##,frameon=False)##
>      ht_ax=plt.subplot(gs[1],sharey=phyl_ax)
>      ##gs.tight_layout(fig, rect=[1,1,2,2])
>      ht_ax.set_xlim(0,35)
>      ht_ax.set_ylim(0,35)
>      ##ht_ax.grid(color='white',linestyle='-',linewidth=1)
>      ##fig.subplots_adjust(hspace=0)
>      cb_ax,kw =mpl.colorbar.make_axes(ht_ax, shrink=0.65)
>
>      plt.setp(phyl_ax.get_xticklabels(),visible=False)
>      plt.setp(phyl_ax.get_yticklabels(),visible=False)
>      plt.setp(ht_ax.get_xticklabels(),visible=True)
>      plt.setp(ht_ax.get_yticklabels(),visible=True)
>      plt.setp(phyl_ax.get_xticklines(),visible=False)
>      plt.setp(phyl_ax.get_yticklines(),visible=False)
>      plt.setp(ht_ax.get_xticklines(),visible=True)
>      plt.setp(ht_ax.get_yticklines(),visible=True)
>
>
>      img = ht_ax.imshow(data, cmap=cmap,
> interpolation='none',vmax=threshold)
>      cb = mpl.colorbar.ColorbarBase(ax=cb_ax,cmap=cmap,
> extend='neither',**kw)
>      cb.cmap.set_over('green')
>      ##image_file =
> cbook.get_sample_data('/home/asmariyaz/Desktop/mytree.png',asfileobj=False)
>      ##image = plt.imread(image_file)
>      img= mpimg.imread('/home/asmariyaz/Desktop/mytree.png')
>      phyl_ax.imshow(img,interpolation='nearest')
>
> heatmap_file=fig.savefig('/home/asmariyaz/Desktop/heatmap/'+file_handle+'.pdf',bbox_inches='tight')

Try giving savefig a dpi kwarg to increase the resolution with which the 
image is saved in the pdf?  Turn off anti-aliasing when you make the png?

Eric



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