Megascriler, I think there is a limit to the output image (i.e., how big a file you can save), but the input image has no limit.
Why now download it and try? Very fast and easy.
I bought the Home version simply to help support the developers and in recognition of the hard work and effort they have put in to bring us such a program. Also, can output to much larger files and in TIFF format if necessary (important if you havr to prepare files for designers, printers etc as they usually accept only tiff files and not jpeg).