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<H1>TIFF2BW</H1>
Section: User Commands  (1)<BR>Updated: October 15, 1995<BR><A HREF="#index">Index</A>
<BR><A HREF="index.html">Return to Main Contents</A>
<HR>

<A NAME="lbAB">&nbsp;</A>
<H2>NAME</H2>

tiff2bw - convert a color
<FONT SIZE="-1">TIFF</FONT>
image to greyscale
<A NAME="lbAC">&nbsp;</A>
<H2>SYNOPSIS</H2>

<B>tiff2bw</B>

[
options
]
<I>input.tif</I>

<I>output.tif</I>

<A NAME="lbAD">&nbsp;</A>
<H2>DESCRIPTION</H2>

<I>Tiff2bw</I>

converts an
<FONT SIZE="-1">RGB</FONT>
or Palette color
<FONT SIZE="-1">TIFF</FONT>
image to a greyscale image by
combining percentages of the red, green, and blue channels.
By default, output samples are created by taking
28% of the red channel, 59% of the green channel, and 11% of
the blue channel.
To alter these percentages, the
<B>-R</B>,

<B>-G</B>,

and
<B>-B</B>

options may be used.
<A NAME="lbAE">&nbsp;</A>
<H2>OPTIONS</H2>

<DL COMPACT>
<DT><B>-c</B>

<DD>
Specify a compression scheme to use when writing image data:
<B>-c none</B>

for no compression,
<B>-c packbits</B>

for the PackBits compression algorithm,
<B>-c zip</B>

for the Deflate compression algorithm,
<B>-c g3</B>

for the CCITT Group 3 compression algorithm,
<B>-c g4</B>

for the CCITT Group 4 compression algorithm,
and
<B>-c lzw</B>

for Lempel-Ziv &amp; Welch (the default).
<DT><B>-r</B>

<DD>
Write data with a specified number of rows per strip;
by default the number of rows/strip is selected so that each strip
is approximately 8 kilobytes.
<DT><B>-R</B>

<DD>
Specify the percentage of the red channel to use (default 28).
<DT><B>-G</B>

<DD>
Specify the percentage of the green channel to use (default 59).
<DT><B>-B</B>

<DD>
Specify the percentage of the blue channel to use (default 11).
</DL>
<A NAME="lbAF">&nbsp;</A>
<H2>SEE ALSO</H2>

<I><A HREF="pal2rgb+1.html">pal2rgb</A></I>(1),

<I><A HREF="tiffinfo+1.html">tiffinfo</A></I>(1),

<I><A HREF="tiffcp+1.html">tiffcp</A></I>(1),

<I><A HREF="tiffmedian+1.html">tiffmedian</A></I>(1),

<I><A HREF="libtiff+3">libtiff</A></I>(3)


<HR>
<A NAME="index">&nbsp;</A><H2>Index</H2>
<DL>
<DT><A HREF="#lbAB">NAME</A><DD>
<DT><A HREF="#lbAC">SYNOPSIS</A><DD>
<DT><A HREF="#lbAD">DESCRIPTION</A><DD>
<DT><A HREF="#lbAE">OPTIONS</A><DD>
<DT><A HREF="#lbAF">SEE ALSO</A><DD>
</DL>
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Time: 01:31:47 GMT, November 23, 1999
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