So just to make sure I'm following, What I am trying to do is create a voltage divider with the 75 ohm termination that results in .7 volts at full input? Thus, the 1k I'm currently using is a slightly attenuated signal compared to what I could send?
Also, is any sort of filtering recommended? My pixels are sent at a 25.175 Mhz clock rate. Should I be high or low pass filtering this signal? With the 1k series resistor, i get very faint smearing of the signal. You have to really look to see it.