1. An imaging apparatus, comprising: an imaging device, wherein a frame of an image is divided into three 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, said signal processing unit being configured to process only a first field of the imaging frame to generate a first image, and to process all of the three or more fields of the imaging frame to generate a second image, both of said first and second images being generated and stored every time the imaging apparatus is operated.