This is a function of your Software (and Twain driver).
I use Paperport 6 and/or 7, and in the advanced settings
(I hit that button on the actual "preview screen" window)
I look for a selection -- "descreen".
Works for me.
It also makes half-tone B&W newspaper photos scan
correctly since they also have a repetitive pattern...
Rick Glazier
From: "Steve Tomporowski"
I've got a Canon 4200F scanner and it's doing a great job, it's just
that I have some 'problem' photos. To be specific I've got some
pictures from the 70's that were the textured borderless kind. When I
try to scan them, for some reason, probably reflection, some of the
textures show up as blue 'hairs'. Not very large but they make was a
pristine picture look like the scan of a beat-up photo.
So the question is, has anybody encountered this and found a solution?