The following tutorial will explain how to extract all text from PDFs (including text in images), by using a combination of Ghostscript and a command line OCR tool calledtesseract-ocr. This is yet another guest post by StoneCut.
First we need to convert our PDF to individual image files (TIFF) so we can then OCR-scan them again. We need Ghostscript for that. It’s probably already installed on your system but just to be sure you can run: