>Heavens, there's no need to edit the gradient file manually. You can >easily use the colorselector the gradient editor supplies to set the RGB >values independant of the alpha value, to make RGBA 1.0, 1.0, 1.0, 0. This is embarrassing, I had actually not found that colour editor before. Thank you. (Perhaps it shows the value of keeping data in plain text files, for the clueless but determined user.)