(57) The present invention relates to a method and an apparatus which check, where images
for a plurality of page portions are printed simultaneously, whether or not the image
on each page is properly arranged in a predetermined position. Particularly, the image
of material to be checked is photographed and stored by unit of a section at every
page, and the image is displayed on a monitor television by unit of two opened-pages
to effect said checking. Thus, in the case of the printed matter in which one image
is reproduced over the two-opened-pages, not only checking to see if the arrangement
of pages is proper but also checking to see if there is a difference in density or
tone between left and right pages can be carried out.
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