Pictures Differ Depending on Light and Other Conditions
Pictures Differ Depending on Light and Other Conditions
  • Reporter Lee Ji-a
  • 승인 2014.11.19 11:06
  • 댓글 0
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FEATURE: Art and Science Collaboration
In the past, cameras only had a shoot function. But cameras have started to acquire more and more functions. Now cameras can revise shaking and research to restore brightness of dark pictures is progressing. As cameras have changed, the people who carry cameras has become more various. In the past, DSLR carriers were mostly limited to professionals, but now it is not rare to see an ordinary person holding one. Also cameras in cell phones have advanced to include various functions for a good photo. But people tend to not know well what functions their cameras have and how the functions make a difference. The Postech Times interviewed Kim Baegeun (General Affairs & Safety Management) who is POSTECH? Official Photographer. He explained photography basics by focusing on shutter time and aperture.
Light & Dark
The angle between the light source and camera centering subject is the key. Direct sunlight causes images to appear without any features, and backlight creates a silhouette. Depending on the angle, part of the subject appears and the pictures become quite different. Also picture in backlight is different depending on the aperture. If aperture is open a lot, background does not appear clearly. Only the subject is depicted in vivid detail. If the subject is a person people can see the soft hair of the subject’s face. If aperture is open a little bit, only a silhouette of subject appears but the background appears in detail.
People are likely to think that purity lighting is good for a colorful picture. But in backlight if aperture is open a lot, the colors appear more vivid. These days every camera has Live View function, which allows the user to check the picture and control the degree of opening aperture. Many cell phones also have similar functions now. 
People & Landscape 
The way to take portrait or landscape is quite different because the depth of field is different (depth of field means the range of focus). In landscape photographs, the edge needs to be in focus. To broaden the range of focus, aperture has to be tight. This limits the light supplied so the shutter time needs to be longer. So some photographers take a landscape for a 6~7 hours. But in case of portrait it is enough to focus only on the subject. So the aperture can be opened more to create a shallower depth of field. This allows a lot of light to enter the camera, so the shutter time can be very short. In addition, when taking a picture of moving people, a “moving” function can be used. It sets a very short shutter time to diminish the effects of shaking.
Lenses are also an important part of photography. Roughly there are three kinds of lenses, normal lenses, telephoto lenses, and wide-angle lenses. In taking landscape, wide-angle lenses are better whereas in taking portrait, telephoto lenses are better.
Kim said, “To get a good photo, you need to master all functions in your camera. And suppose that you paint the scene and think about where people have to stand and whether props are needed for better paint. Last control aperture and shutter time. Now you can see your picture live. Imagining your picture, decide the proper aperture and shutter time. It is better to set the camera to manual, not auto.”