Exposure level can be interpreted as an image brightness level. Exposure is one of the factors that need to be noticed in the process of taking pictures as it will greatly affect the quality of an image. In general there are three kinds of levels of exposure. They are under exposure, normal exposure and over exposure. Here is a picture as an example of exposure.
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| 3 exposure levels |
Under exposure will cause the resulting image is too dark, so we'll lose image detail in dark areas. Over exposure will cause the resulting image is too bright, so we'll lose image detail in bright areas. Normal exposure will produce a balance in areas of dark and light so that we will get good detail in dark areas and bright.
In photography, exposure is affected by three main factors. These three factors are often referred to as the triangle of exposure. Three factors are:
1. Sutter speed
2. Aperture
3. ISO setting
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| Exposure Triangle |
Three factors above are influenced by the existing facilities at the camera. SLR camera have better facilities when compared with a pocket camera. A brief explanation of the effects of three factors are as follows:
1. "Fast Sutter speed" produces a dark image, "slow sutter speed" produces bright images.
2. "Small aperture" produce dark images, the "big aperture" produce brighter images.
3. "Low ISO 'produces dark images," high ISO "produce brighter images.
Exposure indicator on the camera is usually described as below:
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| Exposure indicator |
If the position indicator in the middle (0), it is called a normal exposure, if on the left side (-) then it is called under exposure and if on the right side (+) then called over exposure.
In the operation of the camera using full automatic mode, exposure indicator will always be in the middle (normal exposure) because this position is the default position of most of the cameras. Any brand camera will have a different image characteristics despite similar exposure indicators. For example, "KODAK" has brighter image characteristics, but "CANON" tend to be darker and cool (sorry, this is just my personal opinion).
In certain conditions would be very difficult to get a normal exposure. For example when we take a picture of an object with a very bright background. In this case we must have a priority because the camera is just a machine that is not as good as the human eye. If our priorities on the object then the camera will choose to use a slow sutter speed or big apperture or high ISO. This setting will produce a detailed image on the object but as the risks will result in over exposure in the background. Conversely, if our priorities in the background then the camera will choose to use high sutter speed or small aperture or a low ISO. This setting will produce a detailed image in the background but as the risk will result in under exposure to the object.
This above is a serious problem in the field of photography because the details on all aspects of the images are often necessary. But along with technological developments of digital image editing, the above problems have been overcome. There are several software that are categorized as high dynamic range software which are capable of overcoming the limitations of the camera exposure problem. Some software such as Adobe Photoshop, Dynamic Photo HDR, Photomatix, and many more use digital manipulation has proven to give good results. So with this software is no longer exposure problem on digital cameras.
Tags: exposure, brightness, photography, digital cameras
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