IMAGE FORMING APPARATUS HAVING IMAGE DISPLAY UNIT

In a mode of continuously forming different images, such as a serial page copy mode and an enlargement serial copy mode, which of the images are to be formed, and how they are to be formed is previewed prior to the start of a copy operation. At an operation unit an operator sets a selected mode, for example, the serial page copy mode, by sequentially depressing a preview key and an image reading key to supply image data to a preview processing unit which displays the output image on a CRT prior to printing. The output images may be displayed in the order to be copied. The output images may also be collectively displayed on the same screen, or the continuous display during preview may be temporarily interrupted or resumed at a desired timing.