[Image-SIG] Making the "outside" of an image transparent

[Fredrik Lundh]

Paul Moore wrote:

> So I can get transparency set, but I still don't know a good flood
> fill algorithm.

eric raymond posted a nice implementation last year, which will go
into 1.1.6:

    http://article.gmane.org/gmane.comp.python.image/1753

(note that his code doesn't work on PIL Image objects; mapping this
to corresponding PIL methods is left as an exercise etc etc)

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