Scan looks good, artifacts in saved tiff file

[PatrickM]

I've been using my Plustek 7600i with the latest Siverfast AI successfully for the past couple of weeks. Just today I scanned a couple of roles of B&W negatives, all of which looked good in Silverfast. When I opened the tiffs, I found some nasty artifacts on every image. I've attached an example.

As I said, this image looked fine in Silverfast when I scanned it. Is this a problem with my scanner or Silverfast?

Thanks,

Patrick

[LSI_Ketelhohn]

Dear Patrick,

B&W images can not be corrected using iSRD.
The silver halide emulsion distorts the infrared beam.Please use the software sided SRD to correct scratches and dust.

kind regards,
Arne Ketelhohn.