//
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// Copyright 2012 Christian Henning, Andreas Pokorny, Lubomir Bourdev
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//
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// Distributed under the Boost Software License, Version 1.0
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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//
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#ifndef BOOST_GIL_EXTENSION_TOOLBOX_COLOR_CONVERTERS_RGB_TO_LUMINANCE_HPP
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#define BOOST_GIL_EXTENSION_TOOLBOX_COLOR_CONVERTERS_RGB_TO_LUMINANCE_HPP
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#include <boost/gil/color_convert.hpp>
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namespace boost{ namespace gil { namespace detail {
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/// - performance specialization double
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/// - to eliminate compiler warning 4244
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template <typename GrayChannelValue>
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struct rgb_to_luminance_fn< double, double, double, GrayChannelValue >
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{
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GrayChannelValue operator()( const double& red
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, const double& green
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, const double& blue ) const
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{
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return channel_convert<GrayChannelValue>( red * 0.30 + green * 0.59 + blue * 0.11 );
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}
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};
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} // namespace detail
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} // namespace gil
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} // namespace boost
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#endif
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