[Matplotlib-users] read a png image with alpha gives uncorrect colors

[Thomas Caswell]

I can't find it right now, but there is an issue on the scikit image issue
tracker which was a similar problem.  I suspect the problem is that our png
read is not sophisticated enough and your png maybe encoded ckmy.

Tom

On Fri, Oct 9, 2015 at 7:19 AM PBrockmann <Patrick.Brockmann at lsce.ipsl.fr>
wrote:

> Hi,
>
> I have encountered a problem with this simplified code where I produce
> a windrose with some alpha level.
> Then read this png image to check.
> Then discover that the colors are not correct.
>
> What is the mistake ?
> I am puzzled.
>
> I use matplotlib 1.4.3
>
> The correct windrose with alpha colors
> <http://matplotlib.1069221.n5.nabble.com/file/n46131/windrose.png>
>
> The read png image.
> <http://matplotlib.1069221.n5.nabble.com/file/n46131/read.png>
>
> Regards
> Patrick
>
>
>
>
>
>
>
> --
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