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.TH "TIFF2BW" "1" "Dec 17, 2022" "4.5" "LibTIFF"
.SH NAME
tiff2bw \- convert a color TIFF image to greyscale
.SH SYNOPSIS
.sp
\fBtiff2bw\fP [ \fIoptions\fP ] \fIinput.tif\fP \fIoutput.tif\fP
.SH DESCRIPTION
.sp
\fBtiff2bw\fP converts an RGB or Palette color TIFF
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
\fI\%\-R\fP, \fI\%\-G\fP, and \fI\%\-B\fP options may be used.
.SH OPTIONS
.INDENT 0.0
.TP
.B \-c compress
Specify a compression scheme to use when writing image data:
\fB\-c none\fP for no compression,
\fB\-c packbits\fP for the PackBits compression algorithm,
\fB\-c zip\fP for the Deflate compression algorithm,
\fB\-c g3\fP for the CCITT Group 3 compression algorithm,
\fB\-c g4\fP for the CCITT Group 4 compression algorithm,
\fB\-c lzw\fP for Lempel\-Ziv & Welch (the default).
.UNINDENT
.INDENT 0.0
.TP
.B \-r striprows
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.
.UNINDENT
.INDENT 0.0
.TP
.B \-R redperc
Specify the percentage of the red channel to use (default 28).
.UNINDENT
.INDENT 0.0
.TP
.B \-G greenperc
Specify the percentage of the green channel to use (default 59).
.UNINDENT
.INDENT 0.0
.TP
.B \-B blueperc
Specify the percentage of the blue channel to use (default 11).
.UNINDENT
.SH SEE ALSO
.sp
\fI\%pal2rgb\fP (1),
\fI\%tiffinfo\fP (1),
\fI\%tiffcp\fP (1),
\fI\%tiffmedian\fP (1),
\fI\%libtiff\fP (3tiff),
.SH AUTHOR
LibTIFF contributors
.SH COPYRIGHT
1988-2022, LibTIFF contributors
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