Under "Set Up" and "Video Format" what setting will give me the best HD .jpg images on my HDTV that will operate in 720P or 1080I?
The HDTV is a Samsung HLR4667WX/XAA
I believe that is a 2005 model DLP RPTV? It's "native" resolution would likely be 1280x720, I don't anyone made a "native" 1920x1080 DLP back then. But I can't find the specs on Samsung web site in a quick search, so I'm guessing.
If it's truly "native" 720, >I< personally would set the Roku to that.
I don't seem to see a difference between the two settings.
That means the Samsung has a good scaler, at least as good as YOUR eyes can discern. You might notice some difference if you look closely during high action sports (like a football game on ESPN or ABC or FOX who broadcast in 720p) or a high action/adventure movie.
As a related question, If I set my camera to record images at a higher setting will I notice a difference. For example: 6 MB vs. 2MB
Any resolution (not file size) higher than either 1920x1080 or 1280x720 (depending on your setting above) your Roku is going to be throwing away pixels, so for purposes of viewing on the Roku I don't think there would be much difference. >MY< recommendation is to always shoot at the full resolution the camera offers, you can never go back and shoot the shot again at higher res if you should decide 5 years from now to make a print or something.