>Make a custom gradient that is white on one end and transparent on the >other. (Go on, use the RGBA 0, 0, 0, 0 option provided on the menu.) > >Now use it with the blend tool on a white canvas. The result is a gray >band. This could be remedied by allowing the gradient editor to use alpha=0 with colours other than black. I have sometimes been forced to edit gradient files manually for this. The Gimp's alpha model is slightly different from the premultiplied paradigm where alpha is a nonseparable part of each pixel value. (This is why "anti-erase" works at all.) The gradient editor actually thinks in premultiplied terms in that it only offers a black transparent colour, and that is the bug.
