Re: [Matplotlib-users] Facecolor not changing for web service?

[Eric F. <ef...@ha...>]

On 02/20/2012 01:36 PM, Jeffrey Melloy wrote:
> I'm using Flask to output graphs to a web service, and when I move
> from a standalone script to the web service I'm getting weird
> behavior.
>
> In gantt_test.py, I do this:
>
> from matplotlib.backends.backend_agg import FigureCanvasAgg as FigureCanvas
> from matplotlib.figure import Figure
> [...]
>
> canvas = FigureCanvas(fig)
> fig.savefig("gantt.png")
>
>
> And it looks nice.
>
> In the web service, the only difference is:
>
>      canvas = FigureCanvas(fig)
>
>      x = StringIO()
>
>      canvas.print_png(x, facecolor="w", edgecolor="w", dpi=100)

What happens if instead of using canvas.print_png you use
fig.savefig(x, format="png")

Eric

>
> And it has a grey background, weirder margins, and seems to be stuck at dpi=80.
>
> What am I missing? The version of python&  matplotlib are the same
> between machines.  One is Windows 7, the other 2K3.
>
> -Jeff
>
>
>
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