Patent ID: 7379073

Claim:
A method of restoring RGB (Red Green Blue) gray scale data comprising: truncating the RGB gray scale data having M bits to generate a first RGB gray scale data having N bits, M being a positive integer and N being an integer less than M; generating a RGB gray scale data information based on a bit discrimination information of the first RGB gray scale data, the bit discrimination information indicating whether a bit value of at least one bit of a color of the first RGB gray scale data is different from other bit values of the color; and when the bit discrimination information indicates that the bit value is different, comparing a bit value of a MSB (most significant bit) of the color of the first RGB gray scale data with a value of a dither table to generate a comparison value; and compensating for the first RGB gray scale data based on the RGB gray scale data information and the comparison value to generate a second RGB gray scale data.