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//usr/share/doc/libtiff-devel-3.8.2/html/man/rgb2ycbcr.1.html
<!-- Creator : groff version 1.18.1 --> <!-- CreationDate: Mon Mar 13 18:03:12 2006 --> <html> <head> <meta name="generator" content="groff -Thtml, see www.gnu.org"> <meta name="Content-Style" content="text/css"> <title>RGB2YCBCR</title> </head> <body> <h1 align=center>RGB2YCBCR</h1> <a href="#NAME">NAME</a><br> <a href="#SYNOPSIS">SYNOPSIS</a><br> <a href="#DESCRIPTION">DESCRIPTION</a><br> <a href="#OPTIONS">OPTIONS</a><br> <a href="#SEE ALSO">SEE ALSO</a><br> <hr> <a name="NAME"></a> <h2>NAME</h2> <!-- INDENTATION --> <table width="100%" border=0 rules="none" frame="void" cols="2" cellspacing="0" cellpadding="0"> <tr valign="top" align="left"> <td width="8%"></td> <td width="91%"> <p>rgb2ycbcr − convert non-YCbCr <small>TIFF</small> images to a YCbCr <small>TIFF</small> image</p> </td> </table> <a name="SYNOPSIS"></a> <h2>SYNOPSIS</h2> <!-- INDENTATION --> <table width="100%" border=0 rules="none" frame="void" cols="2" cellspacing="0" cellpadding="0"> <tr valign="top" align="left"> <td width="8%"></td> <td width="91%"> <p><b>rgb2ycbcr</b> [ <i>options</i> ] <i>src1.tif src2.tif ... dst.tif</i></p> </td> </table> <a name="DESCRIPTION"></a> <h2>DESCRIPTION</h2> <!-- INDENTATION --> <table width="100%" border=0 rules="none" frame="void" cols="2" cellspacing="0" cellpadding="0"> <tr valign="top" align="left"> <td width="8%"></td> <td width="91%"> <p><i>rgb2ycbcr</i> converts <small>RGB</small> color, greyscale, or bi-level <small>TIFF</small> images to YCbCr images by transforming and sampling pixel data. If multiple files are specified on the command line each source file is converted to a separate directory in the destination file.</p> <!-- INDENTATION --> <p>By default, chrominance samples are created by sampling 2 by 2 blocks of luminance values; this can be changed with the <b>−h</b> and <b>−v</b> options. Output data are compressed with the <small>PackBits</small> compression scheme, by default; an alternate scheme can be selected with the <b>−c</b> option. By default, output data are compressed in strips with the number of rows in each strip selected so that the size of a strip is never more than 8 kilobytes; the <b>−r</b> option can be used to explicitly set the number of rows per strip.</p> </td> </table> <a name="OPTIONS"></a> <h2>OPTIONS</h2> <!-- TABS --> <table width="100%" border=0 rules="none" frame="void" cols="5" cellspacing="0" cellpadding="0"> <tr valign="top" align="left"> <td width="10%"></td> <td width="3%"> <p><b>−c</b></p> </td> <td width="5%"></td> <td width="80%"> <p>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 (the default), <b>-c jpeg</b> for the JPEG compression algorithm, <b>-c zip</b> for the deflate compression algorithm, and <b>−c lzw</b> for Lempel-Ziv & Welch.</p> </td> <td width="0%"> </td> <tr valign="top" align="left"> <td width="10%"></td> <td width="3%"> <p><b>−h</b></p> </td> <td width="5%"></td> <td width="80%"> <p>Set the horizontal sampling dimension to one of: 1, 2 (default), or 4.</p> </td> <td width="0%"> </td> <tr valign="top" align="left"> <td width="10%"></td> <td width="3%"> <p><b>−r</b></p> </td> <td width="5%"></td> <td width="80%"> <p>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.</p> </td> <td width="0%"> </td> <tr valign="top" align="left"> <td width="10%"></td> <td width="3%"> <p><b>−v</b></p> </td> <td width="5%"></td> <td width="80%"> <p>Set the vertical sampling dimension to one of: 1, 2 (default), or 4.</p> </td> <td width="0%"> </td> </table> <a name="SEE ALSO"></a> <h2>SEE ALSO</h2> <!-- INDENTATION --> <table width="100%" border=0 rules="none" frame="void" cols="2" cellspacing="0" cellpadding="0"> <tr valign="top" align="left"> <td width="8%"></td> <td width="91%"> <p><b>tiffinfo</b>(1), <b>tiffcp</b>(1), <b>libtiff</b>(3)</p> <!-- INDENTATION --> <p>Libtiff library home page: <b>http://www.remotesensing.org/libtiff</b></p> </td> </table> <hr> </body> </html>