Update 1/23/2017: The Sierra 10.12.3 Update seems to have fixed the issue. If you haven’t already, it’s highly suggested that you update. If you have updated to macOS Sierra 10.12.2 and use Preview to manipulate scanned PDFs, watch out. There seems to be a bug and the OCR text layer can disappear. I’ve replicated this issue on documents scanned with the Fujitsu ScanSnap and the Doxie Q so far. In the comments to my blog post about, awesome DocumentSnap reader Alex writes this: Since updating to macOS 10.12.2 I have found that Preview destroys the OCR layer of PDFs scanned and OCR’d with the latest ScanSnap Manager software if you make any sort of edit with Preview (e.g.
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Apple has released a supplemental security update to address vulnerabilities in macOS High Sierra 10.13. An attacker could exploit these vulnerabilities to obtain sensitive information. US-CERT encourages users and administrators to review the Apple security page for macOS High Sierra 10.13 and apply the necessary update. You can make simple changes to a pdf file using the free built-in Preview App that comes free with OS X. If you double-click on any pdf file in OS X it will open in an application called Preview. Preview has a hidden “Annotations Toolbar’ that will allow you to edit the pdf file. Foxit pdf reader free download - Foxit Reader, Foxit Business PDF Reader, Foxit Reader for Windows Mobile, and many more programs. Best Video Software for the Mac How To Run MacOS High Sierra or Another OS on Your Mac Best Graphic Design Software the Mac Stay Safe with Best Free Password Managers for iPhone View All Guides.
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Deleting or reordering pages). After editing and saving with Preview, the PDF is no longer searchable and text is not selectable. Managed to replicate the problem on another Mac running 10.12.2. Doesn’t seem to affect PDFs scanned and OCR’d with other scanners or applications. Just wanted to warn everyone to perhaps wait before updating, and check that they haven’t unwittingly destroyed their OCR if they have already updated. This was confirmed in the comments by reader Jakub. Since I hadn’t yet upgraded to 10.12.2, I decided to test with scans before and after upgrading, and since I had a Doxie Q sitting on my desk, I tested with that as well to see if it was a ScanSnap thing.
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I also tested Preview on a machine with 10.12.1 and a machine with El Capitan. All ScanSnap scans were done with a using ScanSnap Manager 6.3 L60.
All Doxie scans were done with a exported using Doxie software 2.9.1 (1864). For the test, I scanned documents on Sierra 10.12.1 and 10.12.2, checked that the PDF was OCRed properly, then deleted a page, saved, and re-opened and checked the text again. I have posted comments about this OCR/PDF corruption bug at a zotero website: I showed that Preview will overwrite certain types of OCR information in pdf files. My experience is limited to pdf files with OCR information using Clearscan in Adobe Acrobat. What I have found is that the OCR information is corrupted when the pdf is opened, modified (e.g. Add an annotation), and then saved in Preview.