kopia lustrzana https://gitlab.com/sane-project/backends
83 wiersze
1.9 KiB
Groff
83 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 being 1.0. If the value is larger than
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1.0 then the image is 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
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.RB "[0.." "maxin" "]."
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Its default value 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 must be in the range
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.RB "[0.." "maxin" "]"
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and
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larger than shadow. Its default value is the same as
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.B maxin
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(16383 if not set).
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.PP
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.B 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 bit gamma input then
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.B maxin
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must be set to 255, 1023 for 10
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bits, 4095 for 12 bits, and 16383 for 14 bits. The default is 16383. To find
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out what value
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.B maxin
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has to be, call
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.BR scanimage (1)
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with a very large gamma table
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[0]0-[99999]255 and
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.BR scanimage (1)
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will print an error message with the needed gamma table size.
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.PP
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.B maxout
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defines the maximum output value. Take a look at the output of
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.I scanimage \-h
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to find out what
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.B maxout
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must be. The default value is 255.
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.PP
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.SH EXAMPLE
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scanimage \-\-custom\-gamma=yes \-\-gamma\-table
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`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 sane (7),
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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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.I Oliver.Rauch@Rauch-Domain.DE
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