Aha! Although the graphics on your top layer are text, it is not a "text layer" in that the text information has been discarded (note the difference between the thumbnail of your "Gimp" layer and mine). Once the text attributes of a layer have been discarded, my script treats it as a normal layer wherein transparency gets converted to black in the resulting mask.

The script could be used by first creating a mask on your "Gimp" layer initialized to its alpha channel, but it is probably just as easy if not easier to use the stock GIMP approach of alpha-selecting the "Gimp" layer and then adding a mask to your base layer initialized to that selection.

Bump !

I think we should modify the topic title and move everything the script board !

I think so because contain useful script that as now would be hard to find !
i am sure would be hard to find because even if was a my request for me was hard to trace back this pages
(i searched well in the script board but i didn't think could be in this board for long...)

This is fantastic...absolutely fantastic.

Moved to Gimp Scripts and Plugins per request by PC.