- [ ] implement passing `resolution` [here](https://github.com/constantinpape/elf/blob/master/elf/transformation/converter.py#L295) and [here](https://github.com/constantinpape/elf/blob/master/elf/transformation/converter.py#L346). - [ ] consistent axis order of `resolution` everywhere in [converter](https://github.com/constantinpape/elf/blob/master/elf/transformation/converter.py), right now it's sometimes XYZ, sometimes ZYX, needs to always be ZYX. - [ ] support anisotropic voxel spacing [here](https://github.com/constantinpape/elf/blob/master/elf/transformation/converter.py#L281). - [ ] implement writer for elastix trafos and implement `..._to_elastix` converter
