"For data integrity purposes, we recommend the use of the factory defaults with a quality level set to 'higher,'" the company advised.
Xerox said the machines had warned users for years that character substitution could occur at lower quality and higher compression settings.
A message on a web interface to the copier warns: "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."
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