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+.TH gamma4scanimage 1 "10 Jul 2008" "" "SANE Scanner Access Now Easy"
+.IX gamma4scanimage
+.SH NAME
+gamma4scanimage \- create a gamma table for scanimage
+.SH SYNOPSIS
+.B gamma4scanimage
+.I gamma
+.RI [ shadow
+.RI [ highlight
+.RI [ maxin
+.RI [ maxout ]]]]
+
+.SH DESCRIPTION
+The tool
+.B gamma4scanimage
+creates a gamma table in the format expected by scanimage. You can define a
+.BR gamma,
+a
+.BR shadow
+and a
+.BR highlight
+value. You also can specify the size
+.RB ( maxin )
+and maximum output value
+.RB ( maxout )
+of the gamma table.
+.PP
+.BR gamma
+is a floating point value, neutral value being 1.0. If the value is larger than
+1.0 then the image is brighter.
+.PP
+.BR shadow
+defines the minimum input value that is necessary to create an output value
+larger than zero.  shadow has to be in the range
+.RB "[0.." "maxin" "]."
+Its default value is 0.
+.PP
+.BR highlight
+defines the maximum input value that produces an output value smaller than
+maxout.  highlight must be in the range
+.RB "[0.." "maxin" "]"
+and
+larger than shadow. Its default value is the same as
+.B maxin
+(16383 if not set).
+.PP
+.B maxin
+defines the size of the gamma table. The size depends on the scanner/backend.
+If the scanner uses 8 bit gamma input then
+.B maxin
+must be set to 255, 1023 for 10
+bits, 4095 for 12 bits, and 16383 for 14 bits. The default is 16383.  To find
+out what value
+.B maxin
+has to be, call
+.BR scanimage (1)
+with a very large gamma table
+[0]0-[99999]255 and
+.BR scanimage (1)
+will print an error message with the needed gamma table size.
+.PP
+.B maxout
+defines the maximum output value. Take a look at the output of
+.I scanimage \-h
+to find out what
+.B maxout
+must be. The default value is 255.
+.PP
+.SH EXAMPLE
+scanimage \-\-custom\-gamma=yes \-\-gamma\-table
+`gamma4scanimage 1.8 0 11500 16383 255`
+>image.pnm
+
+.SH SEE ALSO
+.BR sane (7),
+.BR scanimage (1)
+
+.SH AUTHOR
+Oliver Rauch
+
+.SH EMAIL-CONTACT
+.I Oliver.Rauch@Rauch-Domain.DE