I think the line is even more obvious in the black and white version. I don't think you were bothered because you took this with your phone. If you'd had "fancier" camera they may have said something but it was probably obvious you weren't trying to figure out how to beat the game. Good shot!
I seem to have a recollection of no photos in a casino in the States too but nowadays you don't know if people are talking on their iPhones or taking pictures!
