Missing details in scan or strange artifacts.

In case you are scanning an image and dark areas are missing in the final scan or strange artifacts appear, check if iSRD is active. If it is test if the effect also occurs when you turn it off.

The effect can be visible especially in very dark areas.

e.g.:

• People are missing pupils in their eyes.
• Signs are missing their black writing.
• Powerlines and cables vanish
• Contrast borders show strange artifacts
• strange crystal like artifacts

The reason for the behavior is most likely a very dense film material, which blocks the scanner's infrared beam. Most often these effects occur with B&W negative film and Kodachrome slide film. This can also happen when film is developed in a developer bath which was used too long. The silver which is washed out in that bath is accumulating in the bath and at some point the silver goes on to the film which is developed so that there is too much silver in the film.

For film that is only partially effected The iSRD masking tool can be used to exclude the effected areas from the correction or limit correction to unaffected areas.

SilverFast Ai Studio additionally offers the eraser tool in the expert settings which allows faster and easier correction.

For film where the entire image is affected, like most B&W films, you can use SRDx instead of iSRD.

Sample images: