Ok hope this helps, this is so you can get the bg the color you want on the gerber edge
Hope this is clear as mud...
1)import cleaned up image into composer (see pic 1)
2)select image, goto tools>generate decal cut (see pic 2)
3)set both the image and the decal cut vinyl to same vinyl (ie. 220 scotchcal white)
4) draw box (or shape you need for the BG) and fill it with the color you need (black in this case)(see pic 3&4)
Set the vinyl color to 220 scotchcal white.
take generated decal cut,fill with clear,turn it's cuts OFF, and place where you want it on your background.
Select it and background and combine.Take your imported picture and line it up with the clear filled decal cut.
(see pic 5&6 )
5)select everything and output selected.
6)double check your settings and send job to Edge
Hope this helps!
P.S>- If anyone finds a flaw with this, please let me know, But I tried it here and it worked!