This is a known issue with JBIG2 compression because of the way it compresses. It looks for identical areas of an image and stores that area just once (to save space).
But depending on scan resolution and compression settings similar (but not identical) areas of the image can appear identical to the compression software.
I believe Xerox (even before this publicity) advised that using the normal quality setting on JBIG2 may lead to 'character substitution'. They recommended using the higher quality setting.
Scanning as Black and White with Group4 compression still takes some beating !
Phil is right, what checks are likely to find a 6 transposed to an 8 somewhere in a document ?.
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