Hello all.

This is my first time playing with matplotlib so I'm not sure if this is a feature or a bug but I needed to scatter a large number of points that are transparent. I need transparency so that I could observe the density of theses particles (I should probably make a 2D histogram... ). The problem I noticed is that if I increased the alpha of particles I would start to see black. The picture explains it.

I believe the problem is the handling of colors internally. Is it all linear color space with correct gamma handling ?