Observation fields of an electron microscope image and an optical magnifying observation image are smoothly switched. The method allows bananas to remain in the ripened condition for an extended period of time while, at the same time, having improved sweetness and taste characteristics. Methods for improving the accuracy include scanning a document into RGB image data, converting the image data of the scanned document into a first device-independent color space, applying a correction transform to modify the image data in the first device-independent color space to reduce the error in the image data, and mapping the modified coordinates to a second output color space for printing. A plurality of video signal parameters may be measurable from the video signal by the signal analysis module. Thereafter, the vicinity of the terminal through-hole in the terminal is crushed by a crushing punch which is moved for pressing in a direction of arrow, and plastically deformed.