Probably you want to use the Color to Alpha plug-in, and select white.
It's at <image>/filters/color/color to alpha.

On Sat, 12 Apr 2003 [EMAIL PROTECTED] wrote:

> I am new to the gimp and have been working with a scanned sketch.  I am
> attempting to change the background (now white) to a transparent
> background however I am having difficulty separating the actual sketch
> from the background.  I have searched through gimp tutorials, help and
> several books as well as the archives however I have not been successful
> at accomplishing this.  If anyone has any suggestions on how I might do
> this or point me in the right direction for further instruction, I would
> be most appreciative.  Thanks in advance.
> T
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