Hello, I am trying to figure out how to use the gamma controls from the scanimage command line utility. I have a hp 4215 MFC any time I try to put in any of the options for --custom-gamma=yes it tells me unreconized option. I can set the gamma in the xsane program I am not sure it this helps at all. I have searched the internet over for a answer but cannot find the solution.
Thanks for any help you could provide. Thanks Tim
