It seems I've been having problems with sending the #1 post ... most likely my attached JPEG was too large. The previous included an example which didn't show this artifact, accomplished with Nikonscan ... please take my word ... you couldn't tell where the defect was ... I'll not include it here.
It is a screen capture from Photoshop. The difference in quality is something I notice in Vuescan 7.x (since I don't know when ... it seems to me it used to work better, but I cannot refer to an earlier version, but I believe we'd need go back to v.6.x). What I am specifically referring to is the darker pixels in the area corrected ... they seem to be always on the one side, upper and right sides (for a frame not rotated) as if there was a RGB/IR mis-registration. Sometimes there exist lighter pixels opposite the defect. I'll be looking into this a bit more this weekend, but would appreciate anyone else's ability to duplicate it with their Coolscan (mine being a LS-2000). tia ... shAf :o)
<<attachment: DR-artifact.jpg>>