1. A color filter array of an image sensor, the color filter array comprising: a plurality of repeating unit pixel patterns with each unit pixel pattern including: a respective primary color pixel for sensing a predetermined primary color, wherein said predetermined primary color is one of red, blue, and green that are primary colors of light; a respective first secondary color pixel for sensing a first secondary color that is not red, blue, and green; and a respective second secondary color pixel for sensing a second secondary color that is not red, blue, and green, wherein the second secondary color is different from the first secondary color; wherein one of the respective first and second secondary color pixels has a higher area ratio than the respective primary color pixel and the other of the respective first and second secondary color pixels in the unit pixel pattern, and wherein said one of the respective first and second secondary color pixels having the higher area ratio is not a luminance pixel.