Converting a color photograph into a black & white photograph is not a one result affair. There are many, many possible results of black & white conversion. A program like Silver Efex Pro makes this conversion process easy in addition to producing the best results. Starting with a yellow Ferrari F430 Spider, applying a pinhole black & white filter makes the Ferrari appear white while darkening the entire background and foreground. The supercar appears to now glow in its setting.
Starting with the same yellow Ferrari image, choosing the full spectrum inverse filter in Silver Efex Pro flips everything, so that darks appear light and vice versa resulting in the yellow Ferrari looking like a sleek black exotic car. The neutral colored existing background is little changed with this filter, especially since no vignetting is applied either.
So starting with the yellow HDR image of a Ferrari F430 Spider seen above, it is possible to make radically different looking black & white versions of the car photograph. Which is your favorite look--white, black or yellow?