A desired whole slice image corresponding to a whole object is created in a slice image creation device, in which a synthesis processor overlaps a target slice image created by a target slice image creation processor and a support slice image created by a support slice image creation processor. The synthesis processor determines a portion of the overlap region corresponding to a target printing region of the target slice image and/or a support printing region of the support slice image as a whole printing region to be printed, and determines a portion of the overlap region corresponding to both of a target non-printing region of the target slice image and a support non-printing region of the support slice image as a whole non-printing region not to be printed. The synthesis processor colors the whole printing region and the whole non-printing region with different colors to create the whole slice image.
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