Thanks for the help. Master to choice of render sounds the way to go.
May I ask, the images I’m working on are jpgs of an artist’s originals. Some of them are slightly different in dimensions. I’ve found a compromise of 640 by 370 works best for getting the most image real estate for all the images without distorting them noticeably. They are still images of course, and I’m zooming in and panning, so I started with twice the size in photoshop and I’m scale the images to 50% in Prem-Pro. This gives a really clean image when I zoom in.
I’m not a very experienced, or trained editor, so I wondered if there was anything wrong with that workflow?
Also, I’m wondering if Apple will accept 640 by 370 on apps in their app store. The app with video is working on my iPad OK but I’ve yet to send it off for Apple verification.