Split image exposure method

Abstract

A split image exposure method capable of realizing high-resolution and high-quality exposure of an image by suppressing discontinuity of density and color in junctions between split images when the original image divided into a plurality of subdivisions is exposed using a planar element. A LCD panel can be positioned at four different locations in a horizontal plane, and it receives light from a light source in respective locations and can print a transmission image onto a color printing paper through a projection lens system by exposure. A reference mark is captured based on a difference in the amounts of light received by light receiving portions of the sensor, whereby the positioning of the LCD panel can be completed. The occupancy ratio of image data representing each split image is varied in double-exposed or fourfold-exposure areas, and the density of each pixel of the liquid crystal panel is controlled in accordance with this occupancy ratio. As a result, discontinuity of color and density is reduced to almost zero.

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