matplotlib的pcolor中的白线 [英] White lines in matplotlib's pcolor

问题描述

在某些pdf查看器中，例如OSX上的Preview，用matplotlib的pcolor绘制的图上有白线(请参见下图).我该如何摆脱它们?

In some pdf viewers such as Preview on OSX, plots made with matplotlib's pcolor have white lines (see image below). How can I get rid of them?

源代码非常简单(为x，y，z选择任何数据):

The source code is very simple (choose any data for x,y,z):

import matplotlib
matplotlib.use("pdf")
import matplotlib.pyplot as pl
pl.figure()
pl.pcolormesh(x,y,z,cmap="Blues",linewidth=0) 
pl.savefig("heatmap.pdf")

推荐答案

注释具有利用imshow的良好解决方案.当imshow不适合输入数据时(例如，它不是均匀分布的)，通常可以解决此问题，

The comments have a good solution that utilizes imshow. When imshow is not appropriate for the input data (e.g. it is not uniformly spaced) this generally solves this problem,

pcol = pl.pcolormesh(x,y,z,cmap="Blues",linewidth=0,)
pcol.set_edgecolor('face')

如果该方法不能充分减少行数，您也可以尝试以下方法:

If that approach does not reduce the lines sufficiently, you can also try this:

pl.pcolormesh(x,y,z,cmap="Blues",linewidth=0,rasterized=True)

除了减少正方形之间的线条外，此方法还倾向于稍微减小文件大小，这有时很有用.在这种情况下，您可能需要在保存时调整dpi设置(例如pl.savefig("heatmap.pdf", dpi=300))，直到获得满意的结果为止.

In addition to reducing the lines between squares this approach also tends to reduce file size a bit, which is sometimes useful. In this case you may want to tune the dpi setting when saving (e.g. pl.savefig("heatmap.pdf", dpi=300)) until you get something that is satisfactory.

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