This is probably one of the easiest ways to change the cars color in Photoshop.
This method of changing a cars color does not require using any selection tools, we will
use the original car color with a Hue/Saturation Adjustments layer to select the body of the car.
These procedures do not work on grey/silver/black/white cars.
Step 1- Open an image of a car.
To make sure you selected the right color slide the saturation slider to the left. If your cars color turns grey or loses its color you have selected the right color setting. set your saturation slider back to 0.
Step 3- In the Hue/Saturation adjustments panel move the Hue
Slider to achieve the color you desire. You can then use the Saturation slider to control the tone or punch of the color.
that is on the Hue/Saturation adjustments layer to remove any unwanted recoloring by using your brush and painting black were you want to remove the color effects of the layer.