i was thinking of this because i have been trying to sand the back of the sticker down and it was taking the black up. so i needed it to be clear.. so i thought transparency paper. what ever is white will come out clear. the only thing you have to fix is the heat part and AC here we go
1) i picked up transparency paper at staples

2) scan decal and open paint

3) open file and zoom in grab the white paint brush and start filling in
the heat and AC

4) print out and cut out i ran out of all my ink so it came out funky colors. so im going to wait to put it on the car
you can see a part of the AC i didnt do and the heat just to show you

hope this starts you off