Unlike traditional ways of changing a vehicle's body colour, this technique uses layer mask and various blending modes to preserve reflections making it extremely difficult for others to figure out if the image was digitally edited.

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1. Open the image for editing.

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2. Add a new "Hue/Saturation" adjustment layer (Layer> New Adjustment Layer> Hue/Saturation) and set the "Saturation" to "-100". Click OK.

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3. Create a new layer as the top layer and fill it with the new colour of the car.

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4. Set the current layer's blending mode to "Multiply" and add a layer mask (Layer> Add Layer Mask> Reveal All).

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5. With the current layer's layer mask selected, use the eraser tool to erase the areas around the body of the car.

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6. With the Hue/Saturation adjustment layer's layer mask selected, use the "Apply Image" tool (Image> Apply Image) to apply the following properties:

Source: filename
Layer: Layer 1
Channel: Layer Mask

Blending: Multiply
Blending: Multiply
Opacity: 100%

Click OK.

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7. Duplicate the top layer (Ctrl+J), set its blending mode to "Screen" and invert the layer (Ctrl+I).

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8. Make a layer of the current layer's layer mask (Ctrl+Click on the layer mask). Use the "Apply Image" tool (Image> Apply Image) to apply the following properties:

Source: filename
Layer: Background
Channel: RGB
Invert: Uncheckmarked
Blending: Multiply
Opacity: 100%

Click OK.

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9. With the current layer mask selected, use the "Levels" tool (Ctrl+L) and drag the black input slider right until the bleeding edges of the current layer is gone. Make sure that the "Preview" checkbox is checkmarked. Click OK.

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10. Compare the this technique to traditional Hue/Saturation techniques. Rollover the image in this step to see the original image before this technique was applied.