130 lines
2.7 KiB
HTML
130 lines
2.7 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HTML><HEAD><TITLE>Manpage of RGB2YCBCR</TITLE>
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</HEAD><BODY BGCOLOR=WHITE><FONT FACE="helvetica, sans, arial">
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<H1>RGB2YCBCR</H1>
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Section: User Commands (1)<BR>Updated: October 15, 1995<BR><A HREF="#index">Index</A>
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<BR><A HREF="index.html">Return to Main Contents</A>
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<HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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rgb2ycbcr - convert non-YCbCr
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<FONT SIZE="-1">TIFF</FONT>
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images to a YCbCr
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<FONT SIZE="-1">TIFF</FONT>
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image
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<B>rgb2ycbcr</B>
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[
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<I>options</I>
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]
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<I>src1.tif src2.tif ... dst.tif</I>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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<I>rgb2ycbcr</I>
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converts
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<FONT SIZE="-1">RGB</FONT>
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color, greyscale, or bi-level
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<FONT SIZE="-1">TIFF</FONT>
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images to YCbCr images by
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transforming and sampling pixel data.
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If multiple files are specified on the command line
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each source file is converted to a separate directory
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in the destination file.
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<P>
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By default, chrominance samples are created by sampling
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2 by 2 blocks of luminance values; this can be changed with
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the
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<B>-h</B>
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and
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<B>-v</B>
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options.
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Output data are compressed with the
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<FONT SIZE="-1">LZW</FONT>
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compression scheme, by default; an alternate scheme can be
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selected with the
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<B>-c</B>
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option.
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By default, output data are compressed in strips with
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the number of rows in each strip selected so that the
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size of a strip is never more than 8 kilobytes;
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the
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<B>-r</B>
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option can be used to explicitly set the number of
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rows per strip.
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<A NAME="lbAE"> </A>
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<H2>OPTIONS</H2>
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<DL COMPACT>
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<DT><B>-c</B>
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<DD>
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Specify a compression scheme to use when writing image data:
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<B>-c none</B>
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for no compression,
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<B>-c packbits</B>
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for the PackBits compression algorithm,
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<B>-c jpeg</B>
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for the JPEG compression algorithm,
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and
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<B>-c lzw</B>
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for Lempel-Ziv & Welch (the default).
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<DT><B>-h</B>
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<DD>
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Set the horizontal sampling dimension to one of: 1, 2 (default), or 4.
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<DT><B>-r</B>
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<DD>
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Write data with a specified number of rows per strip;
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by default the number of rows/strip is selected so that each strip
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is approximately 8 kilobytes.
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<DT><B>-v</B>
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<DD>
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Set the vertical sampling dimension to one of: 1, 2 (default), or 4.
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</DL>
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<A NAME="lbAF"> </A>
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<H2>SEE ALSO</H2>
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<I><A HREF="tiffinfo+1.html">tiffinfo</A></I>(1),
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<I><A HREF="tiffcp+1.html">tiffcp</A></I>(1),
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<I><A HREF="libtiff+3">libtiff</A></I>(3)
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT><A HREF="#lbAB">NAME</A><DD>
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<DT><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT><A HREF="#lbAE">OPTIONS</A><DD>
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<DT><A HREF="#lbAF">SEE ALSO</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="index.html">man2html</A>,
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using the manual pages.<BR>
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Time: 01:31:47 GMT, November 23, 1999
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</BODY>
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</HTML>
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