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