PhotoShop CS3

[DVierstra]

Open up both images in PS. Select the color in the first Photo (using the eye dropper tool), and then create a layer in the second photo outlining the cars body (minus the windows, mirrors, trim, etc.) Once you have done that, make a selection of the body (moving dotted lines-or what they call marching ants) fill that selection with the color from the first car.



Now de-select (ctrl+delete). You may want an extra layer under your new body color that is desaturated (image, adjust, desaturate).
Using your layers pallete, got to pull down menu where it lists "normal."
Go to "multiply" or "overlay" and you may have to adjust the opacity in layers pallete. Let us know how this works for you.

-DV