This is my first and probably only post as I'm not really good at these things, however, I do need to solve this problem and no matter how much I try, I fail continuously.
Basically I need to turn this
in to this

The resizing is not important, but the gradient is very trouble some. As you clearly see, the raster approach don't look too handsome and I just can't figure out how to do it in inkscape. Using the object fill/stroke thingy, sometimes it works and sometimes it don't, but even when it works, I simply can't seem to figure out how to alter the gradient to serve my needs.
basically I need alpha 255 at the top and alpha 0 at the bottom, though I may want to experiment a bit.
I do hope you can help.
Best regards.