I have recorded some video using the API GetNUICameraDepthFrameRGB32() which gives me a RGB image of the depth information

but somehow now I need to know the Raw depth returned by the API GetNUICameraDepthFrameRaw()

How could I convert the RGB value back to the Raw depth? Or could anyone give me a idea how the API GetNUICameraDepthFrameRGB32() is implemented?

Thanks,