A method for modifying color data in a display system is implemented using hardware circuitry. The method includes receiving first-color data associated with a first bit depth, the first-color data including a first-color data value. The method also includes receiving second-color data associated with a second bit depth that is less than the first bit depth, the second-color data including a second-color data value that corresponds to the first-color data value. The method also includes normalizing the second-color data according to the first bit depth for generating normalized second-color data. The method also includes adding an offset value to each data value of the normalized second-color data to generate offset second-color data, the offset second-color data including an offset second-color data value that corresponds to the first-color data value. The method also includes determining a modified second-color data value using the first-color data value and the offset second-color data value.