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<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> | |
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<a name="NAME"></a> | |
<h2>NAME</h2> | |
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<p>rgb2ycbcr − convert non-YCbCr <small>TIFF</small> | |
images to a YCbCr <small>TIFF</small> image</p> | |
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<a name="SYNOPSIS"></a> | |
<h2>SYNOPSIS</h2> | |
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<p><b>rgb2ycbcr</b> [ <i>options</i> ] <i>src1.tif src2.tif | |
... dst.tif</i></p> | |
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<a name="DESCRIPTION"></a> | |
<h2>DESCRIPTION</h2> | |
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<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> | |
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<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> | |
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<a name="OPTIONS"></a> | |
<h2>OPTIONS</h2> | |
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<p><b>−c</b></p> | |
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<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> | |
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<p><b>−h</b></p> | |
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<p>Set the horizontal sampling dimension to one of: 1, 2 | |
(default), or 4.</p> | |
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<p><b>−r</b></p> | |
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<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> | |
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<p><b>−v</b></p> | |
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<p>Set the vertical sampling dimension to one of: 1, 2 | |
(default), or 4.</p> | |
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<a name="SEE ALSO"></a> | |
<h2>SEE ALSO</h2> | |
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<p><b>tiffinfo</b>(1), <b>tiffcp</b>(1), | |
<b>libtiff</b>(3)</p> | |
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<p>Libtiff library home page: | |
<b>http://www.remotesensing.org/libtiff</b></p> | |
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