[sane-devel] --gamma-table: totally baffled
Sun, 9 Sep 2001 23:23:17 +0200
First, thank you all for coding this great piece of software. It allows
me to build a web-interface to my Mustek 12000SP scanner.
This brings me to my problem: dark scans. It would seem a gamma-
correction of about 2 would solve this. I wish to do this in the
scanimage commandline options, i.e. the option --gamma-table. This
seems to be the only option to solve this problem, as brightness only
pertains to lineart scans. I do color scans.
You see, this option utterly and completely baffles me. I have no
idea whatsoever about the numbers I should put there. Of course
I've searched mostang.com and googled for an explanation. I've
read Poynton's excellent Gamma-faq but even that does not begin to
give a hint. At one time, I copied the complete mostang mailing-list
archive to my harddisk and let grep sweat it out, but I seem to be the
only one not understanding (or using) --gamma-table.
From the sane-sharp manpage I gather one should enter 255
values. Do these numbers describe a curve or something? Do
people seriously enter 255 values after --gamma-table?!
Please enlighten me!