> ....I have found anti-aliased transparent gif files on Gimp related
web pages.

It just looks like.....  There is no way to have a real smooth change
from opaque to transparent with gif.

It looks like, if you work in RGB-Mode till the end and konvert then,
all the smooth changes between colors remain, only the change to
transparent background doesn't work.

What you have seen, probably uses partly the surrounding color as
background instead of transparency.

You can do what you want with PNG


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