Q: If I have a mixed content document, containing some text and some images, can PDF Studio OCR the images only?

PDF Studio can handle mixed content pages, i.e, pages that contain both images and text content. PDF Studio will simply ignore any existing text content and perform OCR on the rest of the page, so that it can recognize and insert text for any image contained on the page.

Note that the text content has to be visible to be ignored for the page to be processed by the OCR engine. If the text is invisible, PDF Studio will consider that the page has already been OCRed and will skip the page. Read more about invisible text and OCR in this other KB entry.