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83 wiersze
2.9 KiB
HTML
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<TITLE>gamma4scanimage.1</TITLE>
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<BODY BGCOLOR=#FFFFFF TEXT=#000000><H1 ALIGN=CENTER><IMG SRC="../images/sane.png" HEIGHT=117 WIDTH=346></H1>
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<H1>gamma4scanimage.1</H1>
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<PRE>
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<!-- Manpage converted by man2html 3.0.1 -->
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<B><A HREF="gamma4scanimage.1.html">gamma4scanimage(1)</A></B> SANE Scanner Access Now Easy <B><A HREF="gamma4scanimage.1.html">gamma4scanimage(1)</A></B>
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</PRE>
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<H2>NAME</H2><PRE>
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gamma4scanimage - create a gamma table for scanimage
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</PRE>
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<H2>SYNOPSIS</H2><PRE>
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<B>gamma4scanimage</B> <I>gamma</I> [<I>shadow</I> [<I>highlight</I> [<I>maxin</I> [<I>maxout</I>]]]]
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</PRE>
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<H2>DESCRIPTION</H2><PRE>
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The tool <B>gamma4scanimage</B> creates a gamma table in the format expected
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by scanimage. You can define a <B>gamma,</B> a <B>shadow</B> and a <B>highlight</B> value.
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You also can specify the size (<B>maxin</B>) and maximum output value (<B>maxout</B>)
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of the gamma table.
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<B>gamma</B> is a floating point value, neutral value is 1.0, if the value is
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larger than 1.0 then the image gets brighter.
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<B>shadow</B> defines the minimum input value that is necessary to create an
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output value larger than zero. shadow has to be in the range
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[0..maxin]. Its default value is 0.
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<B>highlight</B> defines the maximum input value that produces an output value
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smaller than maxout. highlight has to be in the range [0..maxin],
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highlight has to be larger than shadow. Its default value is the same
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as maxin (16383 if not set).
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<B>maxin</B> defines the size of the gamma table. The size depends on the
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scanner/backend. If the scanner uses 8 bits gamma input then maxin has
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to be set to 255, for 10 bits 1023, for 12 bits 4095, for 14 bits
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16383. The default is 16383. To find out what value maxin has to be
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call scanimage with a very large gamma table [0]0-[99999]255 then scan-
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image prints an error message with the needed size of the gamma table.
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<B>maxout</B> defines the maximum output value. Take a look at the output of
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scanimage -h to find out what maxout has to be. The default value is
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255.
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</PRE>
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<H2>EXAMPLE</H2><PRE>
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<B>scanimage</B> <B>--custom-gamma=yes</B> <B>--gamma-table</B> <I>`gamma4scanimage</I> <I>1.8</I> <I>0</I> <I>11500</I>
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<I>16383</I> <I>255`</I> >image.pnm
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</PRE>
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<H2>SEE ALSO</H2><PRE>
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<B><A HREF="scanimage.1.html">scanimage(1)</A></B>
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</PRE>
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<H2>AUTHOR</H2><PRE>
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Oliver Rauch
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</PRE>
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<H2>EMAIL-CONTACT</H2><PRE>
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Oliver.Rauch@Rauch-Domain.DE
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10 Jul 2008 <B><A HREF="gamma4scanimage.1.html">gamma4scanimage(1)</A></B>
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</PRE>
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