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gamma4scanimage(1)							       gamma4scanimage(1)

       gamma4scanimage - create a gamma table for scanimage

       gamma4scanimage gamma [shadow [highlight [maxin [maxout]]]]

       The  tool  gamma4scanimage  creates a gamma table in the format expected by scanimage. You
       can define a gamma, a shadow and a highlight value. You also can specify the size  (maxin)
       and maximum output value (maxout) of the gamma table.

       gamma  is  a  floating  point value, neutral value is 1.0, if the value is larger than 1.0
       then the image gets brighter.

       shadow defines the minmum input value that is necessary to create an output  value  larger
       than zero.  shadow has to be in the range [0..maxin]. Its default value is 0.

       highlight  defines the maximum input value that produces an output value smaller than max-
       out.  highlight has to be in the range [0..maxin], highlight has to be larger than shadow.
       Its default value is the same as maxin (16383 if not set).

       maxin  defines  the  size of the gamma table. The size depends on the scanner/backend.  If
       the scanner uses 8 bits gamma input then maxin has to be set to 255, for 10 bits 1023, for
       12  bits  4095, for 14 bits 16383. The default is 16383.  To find out what value maxin has
       to be call scanimage with a very large gamma table [0]0-[99999]255 then	scanimage  prints
       an error message with the needed size of the gamma table.

       maxout defines the maximum output value. Take a look at the output of scanimage -h to find
       out what maxout has to be. The default value is 255.

       scanimage  --custom-gamma=yes  --gamma-table  `gamma4scanimage  1.8  0  11500  16383  255`


       Oliver Rauch


					   11 Sep 2002			       gamma4scanimage(1)
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