kopia lustrzana https://gitlab.com/sane-project/backends
66 wiersze
1.7 KiB
Groff
66 wiersze
1.7 KiB
Groff
.TH gamma4scanimage 1 "18 august 2002"
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.IX sane-umax
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.SH NAME
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gamma4scanimage
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.SH ABOUT THIS FILE
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This file gives a short information about the usage and options of gamma4scanimage
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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 have to specify the size (
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.BR maxin
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) and maximum output value (
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.BR maxout
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)
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of the gamma table.
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Usage: gamma4scanimage gamma [shadow [highlight [maxin [maxout]]]]
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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 1.0
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then the image gets brighter.
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.BR shadow
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defines the minmum input value that is necessary to create an output value larger than zero.
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shadow has to be in the range [0..maxin].
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.BR highlight
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defines the maximum input value that produces an output value smaller than maxout.
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highlight has to be in the range [0..maxin], highlight has to be larger than shadow.
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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 bits
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1023, for 12 bits 4095, for 14 bits 16383. The default is 16383.
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To find 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 the
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gamma table.
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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 find out
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what maxout has to be.
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.SH Example:
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scanimage --custom-gamma=yes --gamma-table `gamma4scanimage 1.8 0 11500 16383 255` >image.pnm
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.SH SEE ALSO
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scanimage(7)
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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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