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gamma4scanimage(1)	 SANE Scanner Access Now Easy	    gamma4scanimage(1)

NAME
       gamma4scanimage - create	a gamma	table for scanimage

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

DESCRIPTION
       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 being 1.0. If the	 value
       is larger than 1.0 then the image is brighter.

       shadow  defines	the minimum 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 maxout.  highlight must be in  the	range  [0..maxin]  and
       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 bit gamma input then 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 maxin has	to be,
       call scanimage(1) with a	very large  gamma  table  [0]0-[99999]255  and
       scanimage(1)  will  print  an error message with	the needed gamma table
       size.

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

EXAMPLE
       scanimage --custom-gamma=yes --gamma-table `gamma4scanimage 1.8 0 11500
       16383 255` >image.pnm

SEE ALSO
       sane(7),	scanimage(1)

AUTHOR
       Oliver Rauch

EMAIL-CONTACT
       Oliver.Rauch@Rauch-Domain.DE

				  10 Jul 2008		    gamma4scanimage(1)

NAME | SYNOPSIS | DESCRIPTION | EXAMPLE | SEE ALSO | AUTHOR | EMAIL-CONTACT

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