#5 Gamma correction does not work properly

[Elmar]

I have a HP Scanjet G3110 to scan postcards.
I tried to use xsane, but the Gamma correction does not produce reasonable results (stripes of wrong colors).
So I got the latest source of the driver, compiled the standalone version and tried to reproduce the behaviour.
It shows a little bit different behaviour, but still the scans with gamma correction contain stripes of wrong color.
I\'ve attached a zip archive with images demonstrating this behaviour. The jpegs are just for overview.
The other two show the different results when --gamma-off was used and without this option.
The img-win* was scanned under windows to show the scanner itself is fine.

[Elmar]