Re: [matplotlib-devel] Re: [Matplotlib-users] Saving a figure to StringIO or similar

[Nicholas Y. <su...@su...>]

On Tue, 2005-08-30 at 21:16 -0700, Robert Kern wrote:
> Why not use PIL where it's available? backend_agg2.py has a start at
> this. Here's a slightly more fleshed-out (but untested) implementation
> for backend_agg.py :
> 
>   if not is_string_like(filename):
>       try:
>           import Image
>           have_pil = True
>       except ImportError:
>           have_pil = False
>       if have_pil:
>           img = Image.frombuffer('RGBA', (self.width, self.height),
>                                  self.buffer_rgba(0, 0))
>           img.write(filename)
>       else:
>           self.renderer._renderer.write_png(filename)

I've previously had a problem with the origin when doing something
similar with buffer_rgba (resulting in a vertical flip).  Doing:

            im = Image.frombuffer('RGBA', (self.width, self.height),
                                  self.buffer_rgba(0, 0),
                                  'raw', 'RGBA', 0, 1)

fixes that problem.

If a method utilising PIL images in this manner is added I'd suggest
adding a to_pil (or similar) method for those who want to process the
resulting image in some manner requiring PIL.

Nick