Welcome to the forum.
What are the pixel x pixel dimensions of the still image?
What is the Sequence Preset used?
You say that you have tried several Export settings, but it would be helpful to concentrate on one - the one that you need for your delivery scheme, and then give the full details of the settings for that Export file.
Thanks for replying.
The still image I used is 640 x 480, but I turned on the "Scale to Frame Size" so that it covered the whole video screen.
The sequence preset I used was the HDV 1080i25 (50i), so that I can have a high definition video (at least that is how I think this works).
For the export settings, I am aiming for, like I said, a high definition video, 1280 x 720 in dimension. I am a complete newbie in this regard, so if you have to use complicated concepts, I would appreciate it if you explained them beforehand.
You do not go from SD to HD without a great deal of trouble
Since you have an SD image, export to SD