Is there a "bucket fill to transparent" tool in gimp? That is: something which is exactly the same as bucket fill(Shift+B) but which fill to 100% transparent, instead of to a color.
And also: Is there a pencil tool, which will allow me to draw with 100% transparent, instead of with a color?
Edit: I found the solution to 'fill with transparent': Select the 'fuzzy select tool', click the color and then Edit->Cut
I really wish Gimp would support drawing with transparent as a color.
Best Answer
To fill in the transparency with another color, create another layer under the one you want to fill in the transparency to and use the bucket tool to color that layer whatever you want (or with a pencil for multiple colors.
Another method of doing this is to change the threshold on the bucket all the way to 0 if you only want to fill in 100% transparency.
Also, a pencil that draws transparency is called an eraser ;)