I have received a pdf made in Quark 9.3.It is to be printed on uncoated paper so I have to take down the total ink coverage to acceptable levels. I do this using Color Convert in Acrobat (10.1.9), it is an operation I do several times per day and has been doing for years without problems, but of course the overwhelming majority were med by InDesign. But this timeâ€¦ When converting colors it removes shadows, and on a picture of a white snowflake on magenta background the background gets 40% cyan where there previously were none. It really destroys the original like I have never seen before. Looks like a bug to me. Is this "a well-known error"?