If I was a readiris bot, I'd be confused too. (The alignment software is likely getting confused as to where the page starts and ends.) It appears that it bases its alignment feature from the vertical text-lines to the image border, but I've seen images get partially straightened from what looks like 2+ pages appearing in a captured image. However, some relatively good news for Mac only users: Readiris 12 Pro/Corporate for OS X is in fact straightening my images my theory is that it's probably an essential step to crop the raw images BEFORE processing in Readiris. (My last attempt with Omni was brief because of instability.) It seems that all the OCR products are all focused on being primo for PCs and lagging for Macs. This leaves us with a few dedicated pro-level OCR/Scanning software apps for the OS X platform: Readiris, Omnipage Pro X, and Adobe's Acrobat. Fujitsu ScanSnap S1300i portable scanner macintosh 3. or scanner and is capable of opening PDFs and converting them to JPEGs. Epson Workforce ES-50 Portable Scanner best desktop scanner for mac 2.
Android Tablet PC, Mac OS X, Android, Windows 10 and iOS 14 (No Stand) 213 49 99.
They don't have a deskewing feature at all, it takes forever to process 50 pages, etc. Saving the fifth page of a PDF as a JPEG file in Mac OS X's preview for 30. The Best for Android & Windows: OBDLink MX OBD2 Bluetooth Scanner.
UPDATE: For Mac users, I'm saying that ABBYY Finereader for Mac (8.03) is not worth even downloading the trial. Avira Free Antivirus for Mac Best for Overall macOS Protection in 2021.