Since you will do a comparo, please take some steps to show a good result.
Use a digital camera(If it has variable shutter speeds then that's an added bonus-If it does then take several pictures,some a little over exposed).
Don't use flash.
Go to a very dark place which has a dark wall.
Park you car about 25 feet away from the wall.
The place where you car is parked should be level.
This will yield the best output pictures.