diff --git a/include/boost/gil/extension/io/formats/tiff/writer_backend.hpp b/include/boost/gil/extension/io/formats/tiff/writer_backend.hpp
index 3290c3b4b..dfefb2da6 100644
--- a/include/boost/gil/extension/io/formats/tiff/writer_backend.hpp
+++ b/include/boost/gil/extension/io/formats/tiff/writer_backend.hpp
@@ -19,6 +19,8 @@
 ///
 ////////////////////////////////////////////////////////////////////////////////////////
 
+#include <boost/mpl/contains.hpp>
+
 #include <boost/gil/extension/io/tiff_tags.hpp>
 
 namespace boost { namespace gil {
@@ -58,11 +60,10 @@ protected:
 
         // get the type of the first channel (heterogeneous pixels might be broken for now!)
         typedef typename channel_traits< typename element_type< pixel_t >::type >::value_type channel_t;
+				typedef typename color_space_type< View >::type color_space_t;
 
         if(! this->_info._photometric_interpretation_user_defined )
         {
-            typedef typename color_space_type< View >::type color_space_t;
-
             // write photometric interpretion - Warning: This value is rather
             // subjective. The user should better set this value itself. There
             // is no way to decide if a image is PHOTOMETRIC_MINISWHITE or
@@ -87,6 +88,12 @@ protected:
         tiff_samples_per_pixel::type samples_per_pixel = num_channels< pixel_t >::value;
         this->_io_dev.template set_property<tiff_samples_per_pixel>( samples_per_pixel );
 
+				// The other half of the story is that it needs to be premultiplied on the way into the file.
+				if (boost:: mpl:: contains <color_space_t, alpha_t>:: value) { // the pixel type includes alpha_t
+					this->_info._extra_sample_value = EXTRASAMPLE_ASSOCALPHA;
+					this->_info._extra_samples = &(this->_info._extra_sample_value);
+					this->_io_dev.template set_property<tiff_extra_samples>( this->_info._extra_samples );
+				}
         // write bits per sample
         // @todo: Settings this value usually requires to write for each sample the bit
         // value seperately in case they are different, like rgb556.
diff --git a/include/boost/gil/extension/io/tiff_tags.hpp b/include/boost/gil/extension/io/tiff_tags.hpp
index 6779ff041..7a6ca033f 100644
--- a/include/boost/gil/extension/io/tiff_tags.hpp
+++ b/include/boost/gil/extension/io/tiff_tags.hpp
@@ -286,6 +286,7 @@ struct image_write_info< tiff_tag, Log >
     , _tile_length               ( 0 )
     , _x_resolution              ( 0 )
     , _y_resolution              ( 0 )
+		, _extra_samples             ( 0 )
     {}
 
     /// The color space of the image data.
@@ -310,7 +311,10 @@ struct image_write_info< tiff_tag, Log >
     tiff_x_resolution::type               _x_resolution;
     tiff_y_resolution::type               _y_resolution;
 
-    /// A log to transcript error and warning messages issued by libtiff.
+	/// Extra Sample type (for alpha)
+	tiff_extra_samples::type                _extra_samples;
+	uint16_t                                _extra_sample_value;
+	/// A log to transcript error and warning messages issued by libtiff.
     Log                                   _log;
 };