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The Harris shutter is a strip device with three color filters, invented by Robert S. "Bob" Harris of Kodak, for making color photographs with the different primary color layers exposed in separate time intervals in succession.〔 〕 The term ''Harris shutter'' is also applied to the technique or effect. The effect is produced by re-exposing the same frame of film through red, green and blue filters in turn, while keeping the camera steady. This will generate a rainbow of colour around any object that moves within the frame. Some good candidates for subjects include waterfalls (pictured, left), clouds blowing over a landscape or people walking across a busy town square. Traditionally, the technique is either achieved using a camera that allows in-register multiple exposures, and changing filters on the front of the lens. Another alternative was to make a drop through filter that consisted of the three coloured gels and two opaque sections that is literally dropped through a filter holder during exposure. With the advent of digital photography, the process has become a lot simpler – the photographer can simply take three colour photographs on location, and then use software to take the Red channel from one exposure, combine with the blue and green channels from the other two photos to good effect – this even allows for correction of movement if the camera is inadvertently moved between exposures. Another advantage of digital processing is that different results can be obtained by reassigning the RGB channel of each layer. Image:Harris-shutter.jpg|Rushing water captured with Harris shutter Image:Harris shutter falls.jpg|Waterfall demonstrating the Harris shutter technique Image:Harris Shutter by Bruce McAdam.jpg|Example with large scale movement of elements (produced from 3 digital colour images) Image:Harris Shutter with Truck.jpg| Example using a driving truck ==References== 〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Harris shutter」の詳細全文を読む スポンサード リンク
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