fourth object of the present invention will be explained as follows as illustrated in fig1 what is called a knc process type digital system is adopted in the image reproducing apparatus 200 of this example and the image reproducing apparatus 200 comprises a platen 201 made of platen glass referred to as platen glass pg in this example hereinafter a light source 202 for illuminating a document og placed on the platen 201 with a beam of white light a first mirror 203 mounted on a moving member m1 having the light source 202 wherein the first mirror 203 reflects a beam of light sent from the document og a v mirror unit m22 including a second mirror 204 and third mirror 205 which reflect the beam of light sent from the first mirror 203 and an image formation lens 206 through which an image is formed on a line sensor ls1 for red and a line sensor ls2 for cyan through a dichroic mirror shown by dm in fig5 these units compose an image reading section aa the image reproducing apparatus 200 also comprises an image processing section bb in which a digital image signal sent from the image reading section aa is converted into a color signal corresponding to a recording color a writing section cc which emits a laser.