reference/imagick/imagick/getimagealphachannel.xml
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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="imagick.getimagealphachannel">
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<refnamediv>
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<refname>Imagick::getImageAlphaChannel</refname>
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<refpurpose>Gets the image alpha channel</refpurpose>
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<refpurpose>Checks if the image has an alpha channel</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>int</type><methodname>Imagick::getImageAlphaChannel</methodname>
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<modifier>public</modifier> <type>bool</type><methodname>Imagick::getImageAlphaChannel</methodname>
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<void />
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</methodsynopsis>
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<para>
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Gets the image alpha channel value. The returned value is one of the
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<link linkend="imagick.constants.alphachannel">alpha channel constants</link>.
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&imagick.method.available.0x640;
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Returns whether the image has an alpha channel.
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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&no.function.parameters;
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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Returns a constant defining the current alpha channel value. Refer to this
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list of <link linkend="imagick.constants.alphachannel">alpha channel constants</link>.
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Returns &true; if the image has an alpha channel value and &false; if not,
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i.e. the image is <acronym>RGB</acronym> rather than <acronym>RGBA</acronym>
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or <acronym>CMYK</acronym> rather than <acronym>CMYKA</acronym>.
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</para>
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</refsect1>
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</para>
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</refsect1>
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<refsect1 role="changelog">
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&reftitle.changelog;
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<informaltable>
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<tgroup cols="2">
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<thead>
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<row>
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<entry>&Version;</entry>
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<entry>&Description;</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>imagick 3.6.0</entry>
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<entry>
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Returns a &boolean; now; previously, an &integer; was returned.
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</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</refsect1>
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</refentry>
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