Using xsane, I normally set the Gamma value using the coolscan2
backend to "3" for all three colors. Looking at "scanimage", I
cannot find any single setting that seems to handle the same
option. Am I missing something or is there some doc available
which describes building the -gamma-table values from a single-
value setting on the command line?
--gamma-table 0..255,...
Gamma-correction table. In color mode this option
equally affects the red, green, and blue channels
simultaneously (i.e., it is an intensity gamma table).
The description above shows that option --gamma-table
expects
zero or more values in the range 0 to 255. For example, a
legal
value for this option would be "3,4,5,6,7,8,9,10,11,12".
Since
it's cumbersome to specify long vectors in this form, the
same
can be expressed by the abbreviated form "[0]3-[9]12".
What
this means is that the first vector element is set to 3,
the
9-th element is set to 12 and the values inbetween are
interpo-
lated linearly. Of course, it is possible to specify
multiple
such linear segments. For example,
"[0]3-[2]3-[6]7,[7]10-[9]6"
is equivalent to "3,3,3,4,5,6,7,10,8,6".
thanx
--
Steven Lembark 2930 W. Palmer
Workhorse Computing Chicago, IL 60647
+1 773 252 1080
