You are welcome, Mick!
There are several programs and techniques to use, but the following are representative of the essentials:
1) Take picture of the car from slightly up and behind.
2) Save the picture in Bitmap format (.bmp)
3) Use 24-bit color
4) Resize the picture to its final size: 80 x 80 pixels
5) "Cut out" the car using Paint Shop Pro (or similar). THIS TAKES A STEADY HAND and for me, it needs to all be done with "one" pass.
6) Create a blank 80 X 80 pixel picture.
7) Copy/paste the cut-out car into the newly created picture, as a "new layer."
8) Use the ‘flood fill’ control to color the area surrounding the car in the new picture, using red (transparency color is 255,0,0) (R=255; G=0; B=0).
(NOTE: Turn off any "feathering" AND/OR "anti-aliasing" in your paint program before filling with red).
9) Save the picture as a .bmp file.
I emphasize that the above method does take a steady hand; sometimes it takes more than one attempt, and is best attempted before the 3rd cup of coffee (smile).
Good luck!