Did you make it a square before you mapped it?
Im not that expert on this subject so I'll just tell you what I did:
Grabbed the original and concealed the text below.
Used the color curve option to get the black and brown look.
Augmented the contrast
Then I used this "Maps" option and turned the image into a sphere.
Saved it on JPG (cause the DDS image itself was to big, this way I make it a flat image i think)
Opened it again and then saved it to DDS and placed on game.
It's very easy to place the sphere on a transparent background but for some reason freespace seems to crash when trying to open the .dds file.
EDIT:
Got it into a transparent layer, and figured it out to make it work with mediavps ^^


Edit 2:
well I've been working on some moon pic also, here it is, didnt want to make a new post cause I dont want to make a fuss over this wich looks a little crappy also xD

