1. A method of image processing, the method comprising: determining a supplement pixel of which data is generated by scaling input image data and a plurality of original pixels of which data correspond to the input image data, wherein the original pixels are adjacent to the supplement pixel; deriving luminance data of the original pixels from the input image data; calculating a difference value among luminance data of the original pixels; selecting an original pixel among the original pixels as an effective pixel when a difference value of luminance data of the original pixel and a nearest original pixel to the supplement pixel among the original pixels is smaller than a predetermined threshold value; setting a weighted value of the effective pixel based on a distance between the supplement pixel and the effective pixel; and calculating luminance data of the supplement pixel based on luminance data of the effective pixel and the weighted value.