boost::gil::subsampled_view

template<typename View>
dynamic_xy_step_type<View>::type
subsampled_view(
    View const& src,
    View::point_t const& step);

template<typename... Views>
dynamic_xy_step_type<any_image_view<Views...>>::type
subsampled_view(
    any_image_view<Views...> const& src,
    point_t const& step);

template<typename View>
dynamic_xy_step_type<View>::type
subsampled_view(
    View const& src,
    View::coord_t x_step,
    View::coord_t y_step);

template<typename... Views>
dynamic_xy_step_type<any_image_view<Views...>>::type
subsampled_view(
    any_image_view<Views...> const& src,
    std::ptrdiff_t x_step,
    std::ptrdiff_t y_step);