The easiest way would probably be:
to cut out the Camaro and fill in the void with the same color as the background. Then take a picture of an FRS at the same angle and height. Create a new project in photoshop with the image of the FRS. Cut out the FRS and make it grayscale. Turn anything that is dark gray to black and lightgray to white. Then create a negative, and paste the created photo into the original project with the "attached image" in your online post. Adjust and correct for color.
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