blender uv to image editor

quick question about blender, im guessing most people on here have used it.

in the uv export i always get the faces greyed out onto my image editor, is there a way just to get the black edges and the faces transparent.

the reason i ask i because i never directly draw to my uv i always right what each part is and then lock it so it cant be edited again, then all my new layers are done underneath it, however this means i get the greyed out faces on top. obviously when i save it i disable the layer most of the time. but the real annoying bit is when im drawing the grey faces are always there making the image seem like its slightly lighter.

so this is really a time saving feature i would like to have does anyone know of how to do this without haveing to do stupid things like deleting the face in image editor or taking s screen shot or anything stupid like that.