1. An imaging apparatus, comprising: an imaging device, wherein a frame of an image is divided into 3 or more fields, the fields are output one by one, and each field contains full color information; a drive circuit for driving the imaging device at predetermined timing; a timing generating circuit for generating the timing; and a signal processing unit for processing an output of the imaging device to generate a brightness signal and a color signal; wherein an image that is signal-processed only with a first field of the imaging frame is stored in addition to an ordinarily signal-processed image.