A panoramic image preparing method comprises a step of setting a measurement range 70 so as to include objects to be measured 72, 73, and 74, a step of dividing the measurement range as required and setting two or more sections 71 and a step of synthesizing partial images 81 photographed for each of the sections and preparing a panoramic image 80, a step of photographing each of the sections under two or more image pickup conditions and a step of synthesizing the panoramic image by using the partial image photographed under an optimal image pickup condition at least about the object to be measured.
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