Hi Oliver, O.k., I didn't thought enough what happens to the data if one applies a function to it... I think I understood it now. But: even if I reset the color corrections directly before the scan, the histogram has its spikes+holes. But there is no visible difference between an image scanned by xscanimage and xsane, both with linear transfer function. So I won't complain.
Regards Karsten Oliver Rauch wrote: > > when you set color corrections to default value: > gamma=1.0, brightness=0, contrast=0 before you do > the scan/preview scan the histogram should not > have any spikes/holes. > > When you use other color correction values with xsane > or define a custom gamma table with xscanimage > you will get the spikes/holes. >
