As analog TV still sends a B & W picture as well as colour (chromanance & lumanance) so as to remain backward compatible for B&W viewers (well back in the 70s anyway!), my question is.... Does digital do the same or just send colour? Or is there more to it than that? Is a B&W signal still required in the processing for older colour TVs or can the STB handle all this processing? If it is a raw colour signal only then would standard VCRs benefit from having RGB recording capabilities?