I’ve tried the iPad as a backlight before this app and I got the pixels showing through from the screen lighting it myself.
I’ve also tried white paper, backlit white paper, vellum, a proper backlight for viewing film and anything I can think of with bad results. I cant get the app to do much yet to see if it corrects for the above mentioned issues like paper grain or screen leds being obvious etc.
I think the best result I got (in the past) was using, of all things, the Lomography film scanner’s main body with the backlight on it and just shooting w the reg camera off the neg and cropping it down. Hoping FL can streamline this process.
I have a very nice scanner and prefer to use it but the idea of popping off some scans here in FilmLab in a few minutes for a roll just is much more preferable when I’m posting to social media etc and not trying to do print quality.