> > Now, the question. 
[...]
> > As a workaround, I'm doing something like:
> > 
> >     if pil_image.mode == 'RGBA':
> >         alpha = pil_image.split()[3]
> >         mask = wx.EmptyImage(*alpha.size)
> >         mask.SetData(alpha.convert('1').convert('RGB').tostring())
> >         bmp.SetMask(wx.Mask(wx.BitmapFromImage(mask, 1)))
> > 
> > But the results are not perfect (see
> > http://web.tiscali.it/agriggio/wx_pil.html)
> > 
> > So I'd like to know if there's a better way to do this.
>  
>  
>  Not currently, but 2.5 is getting alpha support in wxImage and wxBitmap, 
>  as well as some other nice image/bitmap enhancements...

This is good news, great!

Anyway, in the meantime I found something slightly better: I'm not
following the "alpha blendnig road" anymore, it's too weird for my
limited skills at the moment, but I found a decent compromise.

The solution is to use a threshold value when converting the alpha
channel to a monochrome, so that values < 128 become black, and the
others white:

     if pil_image.mode == 'RGBA':
         alpha = pil_image.split()[3]
         mask = wx.EmptyImage(*alpha.size)
         mask.SetData(alpha.point([0]*128 + [255]*128, 
                                  '1').convert('RGB').tostring())
         bmp.SetMask(wx.Mask(wx.BitmapFromImage(mask, 1)))

With this the mask obtained is the "right" one.


Now, another question: you mentioned some image enhancements: will they
allow us not to rely on the PIL anymore for complex manipulations? In
particular, is there some support for better image scaling and lazy
image loading (i.e. loading and rendering the image in small chunks)?


Alberto

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