The "Strange Days" of Phobos-2: in Mars' orbit (3)

Phobos-2 carried the video-spectrometric complex (VSK), 3 CCD cameras and a spectrometer. It was built by a team from Bulgaria, East Germany and the Soviet Union, and extensive image processing was performed at IKI and the Keldysh Institute.
Channel 1 was wide angle with a blue-green filter (400-600 nnmts);
Channel 2 was narrow angle with clear filter (400-1100 nnmts), and
Channel 3 was wide angle with near-infrared filter (800-1100 nnmts).

The raw data was almost unviewable, so it had to be done some computer processing for horizontal sync, dark current and charge-transfer effects (as discussed in "Televizionnye Issledovaniia Fobosa").