如何从具有透明背景的 matplotlib 导出图? [英] How to export plots from matplotlib with transparent background?

问题描述

我正在使用 matplotlib 制作一些图形，但不幸的是我无法在没有白色背景的情况下导出它们.

I am using matplotlib to make some graphs and unfortunately I cannot export them without the white background.

换句话说，当我像这样导出一个图并将其放置在另一个图像的顶部时，白色背景隐藏了它后面的内容而不是让它显示出来.我该如何导出具有透明背景的绘图?

In other words, when I export a plot like this and position it on top of another image, the white background hides what is behind it rather than allowing it to show through. How can I export plots with a transparent background instead?

推荐答案

使用 matplotlib savefig 函数和关键字参数 transparent=True 将图像保存为 png文件.

Use the matplotlib savefig function with the keyword argument transparent=True to save the image as a png file.

In [30]: x = np.linspace(0,6,31)

In [31]: y = np.exp(-0.5*x) * np.sin(x)

In [32]: plot(x, y, 'bo-')
Out[32]: [<matplotlib.lines.Line2D at 0x3f29750>]            

In [33]: savefig('demo.png', transparent=True)

结果:

当然，那个情节并没有表现出透明度.这是使用 ImageMagick display 命令显示的 PNG 文件的屏幕截图.棋盘格图案是通过PNG文件的透明部分可见的背景.

Of course, that plot doesn't demonstrate the transparency. Here's a screenshot of the PNG file displayed using the ImageMagick display command. The checkerboard pattern is the background that is visible through the transparent parts of the PNG file.

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