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'\" te .\" Man page generated from reStructuredText. . . .nr rst2man-indent-level 0 . .de1 rstReportMargin \\$1 \\n[an-margin] level \\n[rst2man-indent-level] level margin: \\n[rst2man-indent\\n[rst2man-indent-level]] - \\n[rst2man-indent0] \\n[rst2man-indent1] \\n[rst2man-indent2] .. .de1 INDENT .\" .rstReportMargin pre: . RS \\$1 . nr rst2man-indent\\n[rst2man-indent-level] \\n[an-margin] . nr rst2man-indent-level +1 .\" .rstReportMargin post: .. .de UNINDENT . RE .\" indent \\n[an-margin] .\" old: \\n[rst2man-indent\\n[rst2man-indent-level]] .nr rst2man-indent-level -1 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]] .in \\n[rst2man-indent\\n[rst2man-indent-level]]u .. .TH "TIFF2BW" 1 "Sep 26, 2023" "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 .\" Oracle has added the ARC stability level to this manual page .SH ATTRIBUTES See .BR attributes (7) for descriptions of the following attributes: .sp .TS box; cbp-1 | cbp-1 l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE = Availability image/library/libtiff = Stability Volatile .TE .PP .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 .\" Generated by docutils manpage writer. . .SH NOTES .\" Oracle has added source availability information to this manual page Source code for open source software components in Oracle Solaris can be found at https://www.oracle.com/downloads/opensource/solaris-source-code-downloads.html. This software was built from source available at https://github.com/oracle/solaris-userland. The original community source was downloaded from http://download.osgeo.org/libtiff/tiff-4.5.1.tar.gz. Further information about this software can be found on the open source community website at http://www.simplesystems.org/libtiff/.