On Thu, Sep 2, 2010 at 2:15 AM, Mitesh Patel <qed...@gmail.com> wrote:
> Hello,
>
> Is it possible to specify both an alpha level and a background color so
> that an entire saved image has a uniform transparency and color? For
> example, with matplotlib 1.0.0, this script yields the attached image:
>
> from matplotlib.pyplot import figure, savefig, show
>
> fig = figure()
> ax = fig.add_subplot(111)
> ax.plot([1,2,3])
>
> fig.patch.set_alpha(0.5)
> for ax in fig.axes:
> ax.patch.set_alpha(0.5)
>
> fig.patch.set_facecolor('red')
> for ax in fig.axes:
> ax.patch.set_facecolor('red')
>
> savefig('test.png', facecolor='red')
>
>
> In particular, the areas inside and outside the axes have different
> transparency level and color. Perhaps I'm over/mis/ab-using the options
> here?It's not that they're not uniform--you're seeing alpha blending between the figure patch and the axes patch. Within the axes, both are being rendered and blended together. This is more readily apparent if you use blue for the axes patch, as I did for the attached image. When the red and blue are blended together, you end up with purple. If you want it all uniform, you'd be better off setting the axes patch to an alpha of 0.0. Ryan -- Ryan May Graduate Research Assistant School of Meteorology University of Oklahoma
<<attachment: test.png>>
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