| 摘要 |
PROBLEM TO BE SOLVED: To prevent such an unsightly boundary line as that is too thick or whose line width differs between right and left or which is tilted from being formed between a photographic image plane and a latent image part by providing a boundary part where negative density is gradually changed. SOLUTION: The latent image part Fa of film F is divided into two, that means, it is formed of an image part Fa1 which is positioned on the side of perforation Fp where the character of a cartoon or the like is exposed as a latent image and a boundary part Fa2 which is positioned on the side of the photographic image plane Fb where density change (gradation) exists. Namely, it is formed such that the negative density of the boundary part Fa2 may be gradually higher from the side of the image part Fa1 to the photographic image plane Fb. Therefore, the negative density is considerably higher at a double exposure part Fc and an object image on the photographic image plane Fb at the double exposure part Fc rather disappears as a print. As a result, the line width of the double exposure part Fc gets unclear, whereby the boundary part is not unsightly even if the line width of the double exposure part Fc is too thick or the line width differs between right and left.
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