Color scans work fine; B&W scans appear corrupted

[fpdel]

I scan color negatives fine with SilverFast Ai Studio 8.8 on an Epson V750 in a Windows 10 environment. (I did a few hours yesterday successfully).

My problem is scanning B&W negatives. I attempted to upload an attachment [in PDF] which shows the scanned image but I get a msg saying "The extension pdf is not allowed." (?)]

During the setup for the scan SilverFast presents (via the pre-scan) a faithful rendition of the image. Things looks normal.

The scanned image looks nothing like the image on negative. The image is corrupted. This problem is repeatable.

I use Workflow Pilot.

Source: Negative
Task: Edit 48---> 24 bit
Vendor: Ilford
Filmt Type: FP4Plus
ISO/ASA: 125

I otherwise take default settings.

Any ideas?

Thx

Fred

[LSI_Ketelhohn]

Dear Fred,

Is maybe the infrared based scratch and dust removal activated (iSRD)?
The infrared beam of the scanner unfortunately is not able to penetrate the silver halide emulsion of B&W films.
The effect is described here.
You can use the software sided SRDx for this film type.

Kind regards,
Arne Ketelhohn.

[fpdel]

Yes, not having iSRD turned off for B&W negatives was the root cause.

Many thanks.

Fred