I want to make one colour of an indexed image transparent. Can you do this
in GIMP?

longer explanation: 
I've taken a photo of a face with a digital camera and have indexed that image, 
as a GIF (to save space for a final animation). I want to make the resulting 
indexed background colour transparent, then distort the image in various ways, 
eg. using Bend, and then insert the various images into layers to make a
GIF animation, with a transparent background. I can do all of this except for 
the transparent background part. 

I've seen other programs that automatically make the bottom left hand pixel
of a GIF transparent but can't see how to do this simply with GIMP. Feel
there should be a simpler way than having to select the face and paste it
into a transparent background -- it would be very difficult to select the face 
- Bill Kerr

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