Algorithms for Rotating the Centers in a Rubenking

I recently made myself a Rubenking cube with stickers from CubeSmith and after solving most of the cube I got stuck with centers that were not aligned properly. Below are the algorithms I found for aligning the centers and completing my solution.

Note that these algorithms will work for picture cubes.

• Case 1: Two centers with 90 degree rotations, hold on the piece that requires a clockwise rotation on the left and the piece that requires a counter-clockwise rotation on the up face and perform the following algorithm: 

  MR’ MU’ MR U MR’ MU MR U’

• Case 2: One center requires 180 degree rotation, hold on top face and perform the following algorithm: 

  (U R L U2 R’ L’)2