Appratus and method of improving image

The image quality improving device and method according to the invention is distinguished from the edge and the dither (Dither) edge of the printing area by the pattern of the actual contour is visually recognized in the image input from the image input device, the edge of the actual contour only serves to hwakdeuk a distortion-free image by emphasizing, according to the present invention, the first unit for estimating the actual edge of the text area is within a predetermined detection zone for the edge detection from the input image including text and images; In a multi-window region to emphasize the edge with a different edge emphasis coefficient in accordance with the saturation value to determine the actual edge with a number, and saturation information of each pixel of the pixel estimated to be an edge from the first unit and the determined edge pixels the second unit includes.