Through training or subliminals? I have to think that the memory improvement sub would help greatly if the subject was also training their visual memory.
Some people just do not have a visual memory component developed well in their brains. Can it be developed? Given that the brain is plastic, probably. But would it result in the capacity for a photographic memory through training or subliminals for such people? I would be surprised if it did.
Then again, I have been slack-jawed in amazement before at what I discovered, so who knows.