[frabjous]

Usually, yes, with some rare exceptions. It is possible with Adobe Acrobat Pro, however, to OCR the text but keep the images as well, and then the text will be selectable even though it's image based.

But basically you should be able to tell just by looking at it. If it looks like a photocopy of a book or something like that, it's probably an image from a scan. If it looks like it might look, e.g., on a Word Processor, or professional at all, it's likely text-based.

Anyway, it's not really that important to find out. PDFLRF and SoPDF will both work with either, it's just that I like the output of PDFLRF better for scans/images, and the output of SoPDF better for text-based ones, especially since using PDFLRF on a text-based one will increase the file size dramatically. You can always do both conversions and load both into your Sony and see which one looks better.