减少matplotlib中pdf图文件的大小 [英] Reducing the size of pdf figure file in matplotlib

问题描述

在 matplotlib 中，我正在使用 LineCollection 绘制国家/地区的颜色，给定的。当我将图形另存为pdf文件时：

In matplotlib, I am using LineCollection to draw and color the countries, where the boundaries of the counties are given. When I am saving the figure as a pdf file:

fig.savefig('filename.pdf',dpi=300)

这个数字很大。但是，将它们另存为png文件时：

the figure size are quite big. However, on saving them as png file:

fig.savefig('filename.png',dpi=300)

然后使用linux convert 命令将它们转换为pdf文件很小。我尝试降低dpi，但是不会更改pdf文件的大小。有没有办法将图形直接从matplotlib中保存为较小的pdf文件？

and then converting them to pdf using linux convert command the files are small. I tried reducing the dpi, however that do not change the pdf file size. Is there a way the figures can be saved directly as smaller-pdf files from matplotlib?

推荐答案

PDF较大，因为它包含所有矢量信息。通过保存PNG，可以生成光栅化的图像。看来，在您的情况下，您可以通过直接对图进行栅格化来生成较小的PDF：

The PDF is larger, since it contains all the vector information. By saving a PNG, you produce a rasterized image. It seems that in your case, you can produce a smaller PDF by rasterizing the plot directly:

plt.plot(x, y, 'r-', rasterized=True)

此处， x，y 是一些绘图坐标。基本上，必须使用附加关键字参数 raterized 才能达到效果。

Here, x, y are some plot coordinates. You basically have to use the additionally keyword argument raterized to achieve the effect.

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