Editor’s Note: Xerox has new information on this issue. Please visit this blog post.
By Francis Tse, principal engineer, Xerox
Recently there have been articles about Xerox devices randomly altering numbers in scanned documents. We take this issue very seriously.
The problem stems from a combination of compression level and resolution setting. The devices mentioned are shipped from the factory with a compression level and resolution that produces scanned files which are optimized for viewing or printing while maintaining a reasonable file size. We do not normally see a character substitution issue with the factory default settings however, the defect may be seen at lower quality and resolution settings.
The Xerox design utilizes the recognized industry standard JBIG2 compressor which creates extremely small file sizes with good image quality, but with inherent tradeoffs under low resolution and quality settings.
For data integrity purposes, we recommend the use of the factory defaults with a quality level set to “higher.” In cases where lower quality/higher compression is desired for smaller file sizes, we provide the following message to our customers next to the quality settings within the device web user interface: “The normal quality option produces small file sizes by using advanced compression techniques. Image quality is generally acceptable, however, text quality degradation and character substitution errors may occur with some originals.”
Xerox is totally committed to customer satisfaction and with this feedback we will look for ways to help our customers better manage their scanning application needs.
For more information, contact Xerox Support at http://www.xerox.com/perl-bin/world_contact.pl#0.