1. A method of improving image quality of a reproduced image, the method comprising: converting red, green, and blue color data of a subject pixel into color data having brightness and chroma components; identifying the subject pixel as a background pixel, a picture pixel, or a text pixel according to the brightness and the chroma components; storing history information of the subject pixel, wherein the history information comprises the number of continued background pixels or continued picture pixels before the subject pixel; detecting features of the subject pixel according to the history information; labeling the subject pixel to be included in one of a text area, a background area, and a picture area according to a state of a previously labeled adjacent pixel and the detected features of the subject pixel; and processing the subject pixel according to the area to which the subject pixel belongs.