1. An image parameter correction apparatus for correcting at least one image parameter for each of a plurality of image forming apparatuses, comprising: an image reading section for reading a prescribed image formed by each image forming apparatus; a correction value calculating means for calculating at least one image parameter correction value corresponding with each image forming apparatus, the at least one image parameter correction value for each image forming apparatus being calculated by comparing the prescribed image from the corresponding image forming apparatus with a reference image; and a transmit section for transmitting the at least one image parameter correction value for each image forming apparatus to the corresponding image forming apparatus, wherein one of the image forming apparatuses forms the reference image.