If your scanner scans one way (BW) but not another (color), that sounds like a different problem than the lack of FTP. FTP allows the scanner to communicate with the computer, and if your scanner is communicating, then the problem with color scanning is probably related to a driver that needs to be updated. If FTP were the issue, then you would have no communication between the scanner and the computer.
On the other hand, I did find a solution to my problem, and that was by buying CrushFTP and getting it set up to do FTP when Apple has abandoned it.