A method of image processing includes determining a supplement pixel and original pixels adjacent to the supplement pixel, deriving luminance data of the original pixels from input image data, calculating a difference value among the luminance data of the original pixels, selecting an original pixel of the original pixels as an effective pixel when the difference value of luminance data of the original pixel and a nearest original pixel to the supplement pixel 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.