如何在不同的操作系统里保存同样大小的matplotlib图片？

One of our tests is failing because the output image is sometimes a slightly different size. On Linux it is 579x517 pixels and on Windows it is 582x520 pixels. I have checked the versions of matplotlib and pandas and they are the same. There are slight differences in matplotlib.rcParams; I've tried changing the parameters that look relevant, but it didn't help.

Is it because the display size is slightly different on the two machines? If I set dpi=99.99 on the savefig on the Windows machine, the output size is 579x517 pixels. I don't want to change this in the application though as it is a bit of a hack just to fix a failing test.

This is the plot function we're using, percentages is a pandas dataframe.

def plot_and_save(percentages, output_directory, filename, title, legend, x_label, y_label,
                  font_size=16):
    """Plot data and save figure to file."""
    matplotlib.rcParams['font.size'] = font_size
    ax1 = percentages.plot.bar(color=['#484D7A', '#F6A124'])
    ax1.grid(which='major', axis='y', color='#4A4A49', alpha=0.1)
    ax1.set_axisbelow(True)  # Puts gridlines below the bars
    ax1.set(xlabel=x_label, ylabel=y_label, title=title)
    ax1.legend(legend, framealpha=1)

    output_path = os.path.join(output_directory, filename)

    plt.savefig(output_path, bbox_inches='tight')
    plt.close()

来源：https://stackoverflow.com/questions/67515453/how-to-save-matplotlib-figures-the-same-size-on-different-operating-systems