An image processing apparatus includes an image area separation device, a compression device, an image storage device, an image area storage device, a data writing device, and an image output state monitoring device. The image area separation device separates input image data into image data and image area separation data. The compression device compresses the image data. The data writing device writes the image area separation data to the image area storage device, secures an initial compressed image storage region in the image storage device, and sequentially stores the compressed image data in the initial compressed image storage region. The image output state monitoring device monitors a compressed image data amount, and causes the data writing device to secure an additional storage region in the image storage device when the compressed image data amount has reached or exceeded a data amount storable in the initial compressed image storage region.