1. An image processing method of an image processing apparatus, the method comprising: discerning pixels to be processed on the basis of a preset reference pixel value in a scanned image that comprises a plurality of pixels; drawing a pixel area including the pixels to be processed from the scanned image on the basis of a preset condition; and selecting whether to apply an image process to the pixels to be processed or the drawn pixel area on the basis of a percentage of the pixels to be processed in the drawn pixel area.