public span_image_resample_gray(source_type src, interpolator_type inter, image_filter_lut filter) : base(src, inter, filter) {}
public span_image_resample_gray(source_type src, interpolator_type inter, image_filter_lut filter) : base(src, inter, filter) { }
public span_image_filter_gray_2x2(source_type src, interpolator_type inter, image_filter_lut filter) : base(src, inter, &filter) {}
public span_image_filter_gray_2x2(source_type src, interpolator_type inter, image_filter_lut filter) : base(src, inter, &filter) { }