PNGs lose axis

[gangemi]

chart.save("test1-chart.svg") has axis, some white space outside of chart.
chart.save("test1-chart.png") has no axis, png ends at boundaries of chart.

[azogue]

For SVG and PNG exports, different matplotlib FigureCanvas classes are used (FigureCanvasSVG for svgs and FigureCanvasAgg if not), but you can pass whatever you need with the canvas_cls= argument to plot.save(), in addition to extra kwargs for the matplotlib's .print_figure() method.

Maybe the defaults are different... or maybe it's a transparency thing? (the frameon attribute of the Figure is set as False, so in PNGs the outside space is transparent.

If you need to set a colored background for the PNG export, you can do this:

# this ensures a figure is created
ax = chart.plot()
# this enables the frame for the background
ax.get_figure().set_frameon(True)
# save with custom facecolor
chart.save("test1-chart.png", facecolor="#FFFF00")

If that's not the problem, could you provide more detailed info to try to reproduce your issue?