1. An apparatus comprising a processor configured to: receive a current block of an image; determine an optimal prediction mode of a plurality of prediction modes for the current block, wherein the optimal prediction mode corresponds to either a standard predictor set or a non-standard predictor set; predict a predicted predictor set based on a first known predictor set and a second known predictor set; clear a first flag if the predicted predictor set matches the optimal predictor set; and set the first flag if the predicted predictor set does not match the optimal predictor set.