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diff --git a/src/png/pixel_traits.hpp b/src/png/pixel_traits.hpp
deleted file mode 100644
index 8ffdfeedb..000000000
--- a/src/png/pixel_traits.hpp
+++ /dev/null
@@ -1,103 +0,0 @@
-/*
- * Copyright (C) 2007,2008   Alex Shulgin
- *
- * This file is part of png++ the C++ wrapper for libpng.  PNG++ is free
- * software; the exact copying conditions are as follows:
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
- * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
- * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-#ifndef PNGPP_PIXEL_TRAITS_HPP_INCLUDED
-#define PNGPP_PIXEL_TRAITS_HPP_INCLUDED
-
-#include <limits>
-#include "types.hpp"
-
-namespace png
-{
-
-    /**
-     * \brief Pixel traits class template.
-     *
-     * Provides information about pixel color type and components bit depth.
-     * Not implemented--see specializations.
-     *
-     * \see  pixel_traits<rgb_pixel>, pixel_traits<rgba_pixel>
-     */
-    template< typename pixel > struct pixel_traits;
-
-    /**
-     * \brief Basic pixel traits class template.
-     *
-     * Provides common implementation for various pixel_traits<>
-     * specializations.
-     */
-    template< typename pixel,
-              typename component,
-              color_type pixel_color_type,
-              int channels_value = sizeof(pixel) / sizeof(component),
-              int bit_depth_value = std::numeric_limits< component >::digits >
-    struct basic_pixel_traits
-    {
-        typedef pixel pixel_type;
-        typedef component component_type;
-
-        static color_type get_color_type()
-        {
-            return pixel_color_type;
-        }
-        
-        static const int channels = channels_value;
-        static int get_channels()
-        {
-            return channels;
-        }
-        
-        static const int bit_depth = bit_depth_value;
-        static int get_bit_depth()
-        {
-            return bit_depth;
-        }
-    };
-
-    /**
-     * \brief Basic pixel traits class template for pixels with alpha
-     * channel.
-     */
-    template< typename component >
-    struct basic_alpha_pixel_traits
-    {
-        /**
-         * \brief Returns the default alpha channel filler for full
-         * opacity.
-         */
-        static component get_alpha_filler()
-        {
-            return std::numeric_limits< component >::max();
-        }
-    };
-
-} // namespace png
-
-#endif // PNGPP_PIXEL_TRAITS_HPP_INCLUDED