Why are the colors wrong when scanning in Ubuntu with HP ScanJet 4400c?

I'm using Ubuntu 10.04 with a HP Scanjet 4400c. When I'm trying to scan a white sheet of paper with black and blue text for example, it looks like this: What could be the problem? I've used different Ubuntu applications (Skanlite ...), all with the same result. According to http://www.sane-project.org/sane-mfgs.html the scanner should be supported. In Windows XP (same computer), the scanner works as expected. Update dec 04 I just updated to Ubuntu 10.10 in the hope that new drivers would be installed. I still get the same result.

Question by pgruetter on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.