A color proof preparing system which includes a control device that transmits image data corresponding to images to be subjected to color proofing, and an image output device that receives the image data and forms the image based on the image data on a recording sheet to output the recording sheet on which the image is formed, as a color proof. Said image output device comprises a detection means that detects the state of the image, a correcting means that conducts correction processing to correct the state of the image to be formed, based on the aforesaid detected state of the image, a recording means that records the contents of the correction processing and the date and hour on which the correction processing was conducted, a historical information storage means that stores the contents of the recorded correction processing and the date and hour on which the correction processing was conducted, and a historical information adding means that conducts processing to add the stored historical information to the image formed on a recording sheet.
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