On Sonntag, 1. Juli 2007, Rodolfo Medina wrote: >> I'm scanning a colour photo and want to diminish the red, but the >> --red-gamma-table option is inactive. What to do? >> >> I have Debian Etch and a Canon CanoScan LIDE 25.
Gerhard Jaeger <gerhard at gjaeger.de> writes: > Try > scanimage --custom-gamma=yes --help > > and --red-gamma-table should be active I did as you suggest, then I did: $ scanimage --mode Color --custom-gamma=yes --red-gamma-table 50 -x 210 -y 290 > photo.pnm , and the --red-gamma-table option was active now. But, maybe because I don't know how to use it, I can't get what I want: any value for --red-gamma-table only turns grey into red and red into grey, more and more from 0 to 255. I also tried with the --gamma-table option, but that remains inactive: $ scanimage --mode Color --custom-gamma=yes --gamma-table 100 -x 210 -y 290 > photo.pnm scanimage: attempted to set inactive option gamma-table . Please, any help? Thanks, Rodolfo
