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Dear Pozzello -

I was not at my main Photoshop computer when I 1st looked at your image -- on my good monitor I'm seeing different problems.  What I thought were the artifacts you were referring to were most likely problems with the monitor I used earlier today.

Just to make sure we are both talking about the same thing, I applied a huge amount of local contrast enhancement to the image you posted and annotated it with two sets of thin lines, one red, and one blue.  See attached.

Question #1: Are either, or both of the areas indicated the artifacts that are bothering you?  If not, can you mark up the contrast-enhanced version to indicate the problem area(s).

Question #2: Can you describe exactly what you posted?  Specifically, is it a scan of a piece of identical film to the one that is giving you problems? If so, was it from the same roll of film?  Was it exposed for mid-gray? Was it wet mounted? What were the scanning parameters (...especially the original resolution).  Did you have more than this one blank piece of film scanned?  If so, are the problems reproducible?  Can you post some of those scans, as well?  Did you have a "blank" scan done?  In other words, a scan with nothing in the optical path except their cylinder.

Thanks,

Tom