Patent ID: 7826111

Claim:
A color conversion method operable in a processing system, the processing system comprising a processor and a memory the processor executing the method steps of: generating a color look-up table using information based on a difference of each channel before and after a conversion of each color by identifying a maximum difference value among the several difference values; and generating a first compressed table to compress the initial difference values using the maximum difference value, wherein each channel value includes a sign bit, wherein compressing the difference values comprises maintaining only a number of bits necessary for storing the maximum difference value, wherein generating the color look-up table further comprises: determining, using a predetermined algorithm, whether precedence bits can be removed in the difference values stored in the first compressed table; if yes, removing the corresponding checked bits and storing the converted channel value in a separate auxiliary color table and, if no, storing an index relating to the auxiliary color table as the corresponding difference value; and generating a secondary compressed table that secondarily compresses the initially compressed difference values and adds a type information that indicates if information stored as each difference value is a difference value or an index; converting the colors using the generated color look-up table; and outputting the converted colors.