은염과 디지털 사진의 재현 특성을 고려한 조명비 조절 방법에 관한 연구

김유경; 김유진

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자료유형: 학술저널

저자정보: 김유경 김유진

저널정보: 한국사진학회 AURA AURA 제21호

발행연도: 2009.1

수록면: 6 - 15 (10page)

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This research is to compare the reproduction characteristics of silver halide and digital photography according to the lighting ratio and understand the difference between them in order to suggest the right control method of lighting ratio in the digital photography. The lighting ratio means the difference in the quantity of key light and fill light and because it affects on the brightness and contrast of overall photography, it is used as a major technique to express a three-dimensional effect of the subject. Also, the brightness and contrast in the photograph can change the delivered information by the subject and emotional and cognitive system of human, therefore, it becomes a significant technique to express the image. Specially, because the lighting ratio in portrait photography plays significant role in portrait of a person, the research on the lighting ratio has been done steadily so far. Therefore, it can be seen that the lighting ratio theory in silver halide had been established as empirical data or literature. As approaching to the digital photography period, however, many photographers are undergoing confusion in reproduction of the lighting ratio in digital photography. It is because that the expression method with the existing experience and data may not be accurately applicable to the digital photography. In digital photography, it reproduces differently from the film according to the characteristic of digital camera. In the experiment of this research, as the lighting ratio becomes higher, the film showed that the brightness of shadow became darker while the digital camera showed the brightness of shadow are became brighter. Therefore, compared to the film, the contrast of photograph taken by digital camera was lower. In order to make similar reproduction with film when using digital camera, similar lighting ratio with film should be maintained from 1:1 to 1:8, but from 1:16, the quantity of fill light should be reduced by 1/3∼2/3 stop sequentially. Or, in case of photographing with the same lighting ratio with film, it is recommended to reduce the brightness of dark area through retouching. As this may be dependent on the kind of processor or what parameter was used, however, it is suggested to test the characteristic of digital camera just as to understand that of film.

This research is to compare the reproduction characteristics of silver halide and digital photography according to the lighting ratio and understand the difference between them in order to suggest the right control method of lighting ratio in the digital photography. The lighting ratio means the difference in the quantity of key light and fill light and because it affects on the brightness and contrast of overall photography, it is used as a major technique to express a three-dimensional effect of the subject. Also, the brightness and contrast in the photograph can change the delivered information by the subject and emotional and cognitive system of human, therefore, it becomes a significant technique to express the image. Specially, because the lighting ratio in portrait photography plays significant role in portrait of a person, the research on the lighting ratio has been done steadily so far. Therefore, it can be seen that the lighting ratio theory in silver halide had been established as empirical data or literature. As approaching to the digital photography period, however, many photographers are undergoing confusion in reproduction of the lighting ratio in digital photography. It is because that the expression method with the existing experience and data may not be accurately applicable to the digital photography. In digital photography, it reproduces differently from the film according to the characteristic of digital camera. In the experiment of this research, as the lighting ratio becomes higher, the film showed that the brightness of shadow became darker while the digital camera showed the brightness of shadow are became brighter. Therefore, compared to the film, the contrast of photograph taken by digital camera was lower. In order to make similar reproduction with film when using digital camera, similar lighting ratio with film should be maintained from 1:1 to 1:8, but from 1:16, the quantity of fill light should be reduced by 1/3∼2/3 stop sequentially. Or, in case of photographing with the same lighting ratio with film, it is recommended to reduce the brightness of dark area through retouching. As this may be dependent on the kind of processor or what parameter was used, however, it is suggested to test the characteristic of digital camera just as to understand that of film.

#lighting ratio #lighting technique #dynamic range #OECF #characteristic Curves

참고문헌 (22)

참고문헌 신청

/ 1999 / ISO (1999), ISO 14524 Photography, Electronic still-picture cameras, Methods for measuring opto-electronic conversion functions(OECFs)

/ 2002 / ISO(2002), ISO 7589 Photography, Illuminants for sensitometry, Specifications for daylight, incandescent, tungsten and printer

Aaland, Mikkel / 2006 / Photoshop CS2 RAW / O'reilly

Evening, M. / 2008 / Adobe photoshop CS2 for Photographer / Focal press

Kim. J. / 2003 / Desigining emotionmally evocative homepages: an empirical study of the quantitative relations between design factors and emotional dimension / International

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김유경

소속기관 한국사진학회

주요연구분야 예술체육학 > 사진

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김유진

소속기관 한국사진학회

주요연구분야 예술체육학 > 사진

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