Hi, the following sample code introduces my problem: #include <boost/gil/extension/dynamic_image/dynamic_image_all.hpp> #include <boost/mpl/vector.hpp> #include <boost/gil/extension/io/jpeg_dynamic_io.hpp> int main() { using namespace boost::gil; typedef boost::mpl::vector<rgb8_image_t, cmyk16_planar_image_t> images_t; typedef any_image<images_t> any_image_t; typedef any_image_view<boost::mpl::vector2<rgb8_view_t, cmyk16_planar_view_t > > any_view_t; typedef any_image_view<boost::mpl::vector2<rgb8c_view_t, cmyk16c_planar_view_t> > any_const_view_t; any_image_t img; jpeg_read_image("test2.jpg", img); any_const_view_t cview( img ); rgb8c_view_t rgb_view = cview; } In the last line I want to convert the any_const_view to a concrete type what runs fail in lack of a member named 'pixels'. Does anyone know about that kind of conversion as the documentation imho doesn't contain such a sample. Right now I have to copy the pixels in the following form but I can't believe that this is necessary: rgb8_image_t rgb_image(img.dimensions()); copy_pixels(color_converted_view<rgb8_pixel_t>(const_view(img)), view(rgb_image)); rgb8c_view_t rgb8c_view( const_view(rgb_image) ); Thanks a lot, Jan.