Abstract: A film checking apparatus which picks up images of two master films placed on two transparent film tables, displays the obtained images thereof on a color monitor thereby allowing for checking of the master films. The apparatus aids the film checking by providing a device for comparing the master films, detecting for the differences and finally displaying the differences in a blinking manner. The apparatus also provides two light sources and a means to switching between the two light sources depending on whether the object is of transmissive-type or reflective-type.

Abstract: The invention provides a previewing apparatus for previewing flats in which characters or color separation films obtained by color separation of an original are attached in a predetermined layout. Utilizing a color CRT monitor, the previewing apparatus can serve for fast checking of registration of the flats, the separation quality, copy, dummy, screen tint and other instructions for completeness and accuracy. Furthermore, the tone of the printed matter can be easily estimated from the flats.