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Technically dpi or ppi doesn't matter, since you're working in onscreen resolution. The only thing that matters is the overall measurement, in pixels. But most people just use 72 ppi anyway.
For a full-screen graphic, use a 640x480 pixel graphic. You can resize it as needed.
Your photos, by the way, aren't going to be terribly sharp no matter what you do. Remember that video resolution is only the equivalent of a 640x480 picture, so you can only get so much detail.
But, once you've added a photo to your video you'll see a red line above the clips on your timeline. Press Enter to render the timeline (the red line will turn green) and you'll at least have a better idea of what your final video output will look like.
Most grateful for that. I've now exported the title at 640px and resized to 60% which looks fine.
Glad to hear it works for you, Miss Moppett!