A converter that records or reproduces information to or from a recording medium while making a movement relative to the recording medium is mounted on a slider. The image quality assessment method is a no-reference method for objectively assessing the quality of medical images. Within each block, a predictor index is chosen that predicts a pixel value as a linear combination of adjacent pixel values. Space is allocated in one of P amounts to an instance of the decimal type field in a row, the amount being chosen based on the size of the value being stored in the instance of the decimal type field. In the printing control apparatus, the printed image has a size determined based on a candidate, which is acquired by a sensor detecting the size of the printing medium and is one of the candidates for a size of the printing medium, corresponding to a combination of a plurality of conditions for specifying the size of the printing medium.