1. An imaging apparatus that reads an image from an original while analyzing the image into pixel data of a plurality of color components, and reproduces the image from the pixel data, the imaging apparatus comprising: a memory region reservation unit that reserves a plurality of memory regions for storing the pixel data of the color components when reading the original image, each memory region being assigned to one of the color components; a color determination unit that makes a color determination as to whether each of the color components is recognized in the pixel data of the image read from the original; and a memory region releasing unit that releases the memory region assigned to the color component that is not recognized by the color determination unit.