I have many thousands of PDFs that were OCRed. to be saved with "text under image" format. Several PCs were workng in tandem. One was accidentally set for "text and image", which does not provide an exact duplicate of the original PDF's appearance. They are readable, but just not exactly the same and we need them to be. I could redo the OCR on the bad ones, but don't know which is which, and not possible to just open them all and look. Is there a way to open a PDF file and determine how it has been saved? IF so, I could scan them all, make a list of bad ones, and go get the originals to be re-OCRed.