Likely via OpenCV, as it supports multiple resizing policies. * [Docs](https://docs.opencv.org/3.4/da/d54/group__imgproc__transform.html#ga47a974309e9102f5f08231edc7e7529d) * [Tutor](https://docs.opencv.org/3.4/da/d6e/tutorial_py_geometric_transformations.html) Splitting channels: * [Docs](https://docs.opencv.org/3.4/d2/de8/group__core__array.html#ga0547c7fed86152d7e9d0096029c8518a)
