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<refentry id="rgb2ycbcr-1">

<refmeta><refentrytitle>rgb2ycbcr</refentrytitle><manvolnum>1</manvolnum>

<refmiscinfo class="date">26 Mar 2004</refmiscinfo>

<refmiscinfo class="sectdesc">&man1;</refmiscinfo>

<refmiscinfo class="software">&release;</refmiscinfo>

<refmiscinfo class="arch">generic</refmiscinfo>

<refmiscinfo class="copyright">&suncopy;</refmiscinfo>

</refmeta>

<indexterm><primary>rgb2ycbcr</primary></indexterm><indexterm><primary>convert

non-YCbCr TIFF images to YCbCr TIFF images</primary></indexterm>

<refnamediv id="rgb2ycbcr-1-name"><refname>rgb2ycbcr</refname><refpurpose>

convert non-YCbCr TIFF images to YCbCr TIFF images</refpurpose></refnamediv>

<refsynopsisdiv id="rgb2ycbcr-1-synp"><title>&synp-tt;</title>

<cmdsynopsis><command>&cmd;</command><arg choice="opt"><option role="nodash"><replaceable>

options</replaceable></option></arg><arg choice="plain"><option role="nodash"><replaceable>

src1.tif</replaceable></option></arg><arg choice="opt" rep="repeat"><option

role="nodash"><replaceable>src2.tif</replaceable></option></arg><arg choice="plain"><option

role="nodash"><replaceable>dest.tif</replaceable></option></arg>

</cmdsynopsis></refsynopsisdiv>

<refsect1 id="rgb2ycbcr-1-desc"><title>&desc-tt;</title>

<para><command>&cmd;</command> converts RGB color, grayscale, or bi-level

TIFF 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.</para>

<para>By default, chrominance samples are created by sampling 2 by 2 blocks

of luminance values, and output data files are compressed with the LZW compression

scheme, with each strip no more than 8 kilobytes. These characteristics can

be overridden or explicitly specified with the options described below.</para>

</refsect1>

<refsect1 id="rgb2ycbcr-1-opts"><title>&opts-tt;</title>

<para>The following options are supported:</para>

<variablelist termlength="narrow">

<varlistentry><term><option>c</option></term><listitem><para>Specify a compression

scheme to use when writing image data:</para>

<variablelist>

<varlistentry><term><option>c jpeg</option></term><listitem><para>Baseline

JPEG compression algorithm.</para>

</listitem></varlistentry>

<varlistentry><term><option>c lzw</option></term><listitem><para>Lempel-Ziv

and Welch algorithm. This is the default algorithm.</para>

</listitem></varlistentry>

<varlistentry><term><option>c none</option></term><listitem><para>No compression.

</para>

</listitem></varlistentry>

<varlistentry><term><option>c packbits</option></term><listitem><para>PackBits

compression algorithm.</para>

</listitem></varlistentry>

</variablelist></listitem></varlistentry>

<varlistentry><term><option>h</option></term><listitem><para>Set the horizontal

sampling dimension to one of the following: 1, 2, or 4. The default value

is 2.</para>

</listitem></varlistentry>

<varlistentry><term><option>r</option></term><listitem><para>Write data with

a specified number of rows per strip. By default, the number of rows per strip

is selected so that each strip is approximately 8 kilobytes.</para>

</listitem></varlistentry>

<varlistentry><term><option>v</option></term><listitem><para>Set the vertical

sampling dimension to one of the following: 1, 2, or 4. The default value

is 2.</para>

</listitem></varlistentry>

</variablelist></refsect1>

<refsect1 id="rgb2ycbcr-1-oper"><title>&oper-tt;</title>

<para>The following operands are supported:</para>

<variablelist termlength="narrow">

<varlistentry><term><option role="nodash"><replaceable>src.tif</replaceable></option></term>

<listitem><para>The name of the input file that contains non-YCbCr TIFF data.

</para>

</listitem></varlistentry>

<varlistentry><term><option role="nodash"><replaceable>dest.tif</replaceable></option></term>

<listitem><para>The name of the output file that contains YCbCr TIFF data.

</para>

</listitem></varlistentry>

</variablelist></refsect1>

<refsect1 id="rgb2ycbcr-1-attr"><title>&attr-tt;</title>

<para>See <olink targetdocent="REFMAN5" localinfo="attributes-5"><citerefentry>

<refentrytitle>attributes</refentrytitle><manvolnum>5</manvolnum></citerefentry></olink>

for descriptions of the following attributes:</para>

<informaltable frame="all">

<tgroup cols="2" colsep="1" rowsep="1"><colspec colname="COLSPEC0" colwidth="1*">

<colspec colname="COLSPEC1" colwidth="1*">

<thead>

<row><entry align="center" valign="middle">ATTRIBUTE TYPE</entry><entry align="center"

valign="middle">ATTRIBUTE VALUE</entry></row>

</thead>

<tbody>

<row><entry><para>Availability</para></entry><entry><para>image/library/libtiff</para></entry>

</row>

<row><entry colname="COLSPEC0"><para>Interface stability</para></entry><entry

colname="COLSPEC1"><para>Uncommitted</para></entry></row>

</tbody>

</tgroup>

</informaltable>

</refsect1>

<refsect1 id="rgb2ycbcr-1-also"><title>&also-tt;</title>

<para><citerefentry><refentrytitle>tiffinfo</refentrytitle><manvolnum>1</manvolnum>

</citerefentry>, <citerefentry><refentrytitle>tiffcp</refentrytitle><manvolnum>

1</manvolnum></citerefentry>, <citerefentry><refentrytitle>libtiff</refentrytitle>

<manvolnum>3</manvolnum></citerefentry></para>

</refsect1>

<refsect1 id="rgb2ycbcr-1-note"><title>&note-tt;</title>

<para>Updated by Breda McColgan, Sun Microsystems Inc., 2004.</para>

</refsect1>

</refentry>