Again using Rectangular Marquee Tool (M) remove all the white areas between the edge and the front of the object. Repeat these steps for all other areas eg. Top, Rear and Bottom. This is to remove any random pixels in these areas to be able to execute the next step.
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Photoshop 06 :
From the file menu select Image > Trim and click ok .
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Photoshop 07 :
As you can see this has trimmed all the areas and left just the object. If skipping step 005 there would still be white areas around the car. This may/may not happen with all blueprints but for this one it did.
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Photoshop 08 :
Repeat the same steps for all maps. Do not worry too much regarding matching sizes as 3D Studio Max will do this part.
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Photoshop 09 :
Now Invert all viewports by clicking Image > Adjustments > Invert (shortcut CTRL + I). You will see white areas where the eraser tool was used to remove the unwanted sections of the image. I changed the Background color to Black to remove these areas.
