Letter Capacity of Photographic Materials
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概要
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It is the purpose of this paper to obtain the marginal reduction magnification and the letter capacity of photographic materials for duplicating use. The letter capacity is defined bymaximum accomodation number of image of reduced letter in specific area of photographic material, when the image quality of the letter is just acceptable. The marginal reduction magnification for 8 point type was 34 with Fuji Minicopy film, and was 26 with Fuji Neopan F film developed by Sease 3 developer. In this case, the letter capacity in the area of 36×24 mm was about 135, 000 with the former film, and was about 79, 000 with the later film. The image quality of the letter was evaluated by psychological scale of five step. Relation of the marginal reduction magnification to the spatial frequency for the specific gain of response function was obtained.
- 社団法人 日本写真学会の論文
社団法人 日本写真学会 | 論文
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