An image forming apparatus of the present disclosure includes an image output unit, a nonvolatile storage unit, an original-image generating device, and a log-image generating device. In one implementation, a DHCT presents a user a menu containing a plurality of selectable link representations corresponding to separate services or applications offered by the cable television system. Accordingly, it is possible to enhance accuracy of photometry measurements without an increase in unnecessary actual measurement data and design value data where an output of a brightness detecting circuit based on an output of the second light sensor is non-linear and an output of a brightness detecting circuit based on an output of the first light sensor is linear. The absorbent structure has a relief for inhibiting the longitudinal folding of the absorbent structure facilitated by the at least one line of weakness from extending beyond the middle portion of the absorbent structure. These support rings and the rollers are assembled via a plurality of needle rollers to constitute roller assemblies capable of relative rotations.