| 摘要 |
As photodetectors for detecting light radiated out of a recording sheet, on which a radiation image has been recorded, during its scanning with reading light, at least a single first photodetector, which has a high detection sensitivity and is apt to undergo a saturation phenomenon at its photoelectric surface, and at least a single second photodetector, which has a low detection sensitivity and undergoes little saturation phenomenon at its photoelectric surface, are utilized. A maximum amount of the amounts of the light, which is radiated out of a region inside of each of predetermined units in the radiation image recorded on the recording sheet, is measured. Image signal components corresponding to a unit, in which the measured maximum amount of the radiated light is larger than a predetermined value, are obtained by using only the signal having been generated by the second photodetector. Image signal components corresponding to a unit, in which the measured maximum amount of the radiated light is not larger than the predetermined value, are obtained by using at least the signal having been generated by the first photodetector.
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