> I have a small gif that has a picture in the middle, with an irregular
> black border around it. How do I set the black border to be transparent?

1 <Image> /image/mode/RGB

2               /image/alpha/add alpha channel

3 then you select the black border, for example

   a  Either with "fuzzy select" (selects similar pixels, you can set it in
the tool properties(doubleclick on the tool icon) even to 0 , then it
selects only pixels with for example the color #000000)

   b  Or with select by color (similar properties, you will see)

4 If it's selected, you cut it  -  it becomes transparent.

5 <Image>  /image/mode/indexed

6  save as gif

I hope it helps   Hago

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