1. An apparatus for automatically adjusting the quality of a scanned image, the apparatus comprising: a conversion module configured to produce a processed image matrix by modifying each value in a scanned image matrix using a table of values assigned to each element of the scanned image matrix; a measurement module configured to determine a quality of the processed image matrix and to store a quality history; and a quality adjustment module configured to adjust the quality of the processed image matrix if the quality history shows a decrease in quality.