What! It's a prized 3-letter handle! I'm rather proud of it. =P

The scikit-image grey functions are 2D only *and* only work with 256 intensity values, so my [suggestion](https://github.com/scikit-image/scikit-image/pull/673#issuecomment-24442288) there has been to just wrap scipy. I'm not sure whether that hasn't been done for real reasons (e.g. speedier implementation) or just lack of bandwidth.