1. A computer-readable medium having computer executable instructions, which when executed performs steps, comprising: coding a coefficient representative of a chrominance component corresponding to an (x, y) coordinate pair into a symbol; computing a plurality of context events based upon a corresponding coefficient of a luminance component at the (x, y) coordinate pair and at least one other coefficient of another luminance component having a coordinate relationship with the (x, y) coordinate pair; and associating the symbol with the context events for context-based arithmetic coding.