FYI:
ALL digital backs (CCDs) are basically monochrome, giving a B&W image. The very first generation of digital backs was using RGB filters in front of the lens (or behind) with 3 exposures in a raw, to get the necessary color information for each basic color channel and to be able to build up a color image.
Nowadays all digital backs are using a pattern of thiny little filters over the pixels, basically to do the very same: to have the color information for the 3 basic color channels R, G and B and to be able to build up a color image.
Best regards,
Thierry