Hi, On Fri, Jul 18, 2003 at 10:29:37PM +0100, Iain Mac Donald wrote: > I have been trying to use scanimage to batch scan some colour slides on > an Epson 2450 Photo. My purpose is to have a digital reference file for > every slide without having to interactively edit each image. Scans using > the standard settings usually appear too dark. I decided to use the > --red-gamma-table option as the --brightness option did not produce the > desired results. The command I used is shown below > > When doing this I get the error message > > attempted to set inactive option red-gamma-table
Well, the option is not active :-) When you run "scanimage -h", you should get an "inactive" marker after the option. > As an alternative I tried to use the --gamma-table option (not listed > for epson) I received this error That one is disabled in the source code. > The scanimage -h man page specifically mentions the red-gamma-table > option (and green, blue). I have also used the --gamma-correction 'User > defined' option at the same time which is accepted but I still get the > same error message. I think "--gamma-correction" must be used before --red-gamma-table in the command line. Does "scanimage --help" list "User Defined" as a possible value for --gama-correction? > Otherwise everything works perfectly. Anyone have a working version of > this or know what is wrong? Is gamma correction unsupported? Any help > much appreciated. I don't have an Epson scanner. But from the source code it looks like that not all scanners support that feature. > scanimage -d epson:/dev/usb/scanner0 --format=pnm --focus-position > 'Focus 2.5mm above glass' --sharpness 2 --resolution 600 > --red-gamma-table '/home/iain/.sane/gammatable.epson ' --source The argument for the --red-gamma-table is the gamma table itself, not a filename. You can generate gamma tables with gamma4scanimage. Bye, Henning
