_filters.push_back(*Filter::from_id("hflip"));
} else if (fabs (rot - 90) < 1.0) {
_filters.push_back(*Filter::from_id("90clock"));
_filters.push_back(*Filter::from_id("hflip"));
} else if (fabs (rot - 90) < 1.0) {
_filters.push_back(*Filter::from_id("90clock"));