1. An image reproduction system comprising an image output means which outputs a reproduced image on the basis of an original image data representing an original image, wherein the improvement comprises that there are provided a periodic pattern removing means which carries out on the original image data a noise removing processing to remove noise of a predetermined periodic pattern, if any, from the original image data and generates storage image data, an image storage means which stores the storage image data and an output image processing means which carries out an enlargement/reduction processing on the storage image data read out from the image storage means and generates output image data, and the image output means outputs a reproduced image on the basis of the output image data.