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gamma4scanimage(1) SANE Scanner Access Now Easygamma4scanimage(1)

NAME
       gamma4scanimage - create a gamma table for scanimage

SYNOPSIS
       gamma4scanimage	gamma  [shadow	[highlight  [maxin  [max-
       out]]]]

DESCRIPTION
       The tool gamma4scanimage creates a gamma table in the for-
       mat  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 maxout.  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.

EXAMPLE
       scanimage  --custom-gamma=yes --gamma-table `gamma4scanim-
       age 1.8 0 11500 16383 255` >image.pnm

SEE ALSO
       scanimage(7)

AUTHOR
       Oliver Rauch

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

sane-backends 1.0.12	   11 Sep 2002	       gamma4scanimage(1)

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