Deskew option not working on skewed PDF. You open a pdf that appears to be skewed and Select "Reduce", "Optimise", and under "Images" verify that deskew is enabled. Click OK and find that the page is still skewed.
The Nuance deskew option only works on pages that are a single image that is skewed 15 degrees or less. If the document contains multiple image segments, the deskew will not work.
If the skew is under 15 degrees, you can save the document as a JPEG image file, then convert this file back into a PDF. This will create a single image PDF file and deskew should work on it.