[sane-devel] Negative scanning calibration...

[Gerhard Jaeger]

Hi list,

quite a lot of scanner support negative scanning, having a extra TPA or TPU.
As the calibration is really bad with the Plustek backend, I'd like to improve
this - BUT HOW?????
On what do I have to take care about? Currently I try to find the darkest and
brightest values, and then I did some fine calibration, but this is not
enough - any ideas? Could somebody shed some ligth on this?

TIA,
  Gerhard