Hi Till, thanks you for the scan positions. You might also tweak the shading posit= ion, which can be done in the plustek-devs.c file around line 595. This positi= on will tell the driver where to find the calibration strip for negative and= =20 transparency scanning. In general this is only a field which is not cover= ed by the transparency - can you check this? Or can you to a positive scan o= f the TPA itself so I might be able to detect this strip?
Thanks Gerhard