I'm using the release version of Pillow, the active development branch of PIL, 
with images2gif.py.

There are three issues here.

First, please see 
https://code.google.com/p/visvis/source/browse/vvmovie/images2gif.py#413

> palette = getheader(im)[1]

In personal communication with wiredfool from the PIL, we looked through the 
PIL code and established that the palette is in fact in getheader(im)[0][-1]


Second, the fallback palette is, from 
https://code.google.com/p/visvis/source/browse/vvmovie/images2gif.py#415

> palette = PIL.ImagePalette.ImageColor

But this is a module, and not appropriate for a color palette!

The correct solution would be to use PIL.Image.convert(mode='P') to convert the 
image to palette mode.  My client code converts everything to mode='P' already 
so I didn't test this.


Finally, there are .encode('utf-8') calls scattered around the code.  These 
won't work - the data given to you by PIL is already in bytes format.  Just 
deleting them seems to be effective.

With those changes, I was able to get this routine to write nice-looking 
animated GIFs!