[Gimp-user] using Alpha Layers to change white to transparent

[saulgoode at flashingtwelve.brickfilms.com]

Quoting Brenton <forums at gimpusers.com>:

> I made the mistake of creating the image to fade to white. Now I want to use
> alpha transparency to have it fade to transparent, for use on non-white
> backgrounds. I know there must be a way to change those faded white layers
> into fading transparencies.

I would recommend merging the white layers together and then  
performing an Alpha To Selection on the resulting layer (hide or  
delete the merged layer afterwards). Then add a layermask to your  
background layer, initialized to the Selection with the "Invert Mask"  
option checked.