com.google.zxing.qrcode.qrcodewriter c# Focus the Scene in Software

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When you press the shutter button halfway, your camera focuses on a subject in your scene that intersects one of the auto-focus points Most cameras have multiple auto-focus points Your camera may have the option to switch to a single auto-focus point, in which case the camera will focus on the object nearest to the single auto-focus point you ve selected High-end digital cameras and digital SLR cameras usually have two auto-focus modes: a one-shot mode for still subjects and a mode where the camera focuses continuously on a moving subject
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Many cameras offer the option of switching to a single autofocus point This is useful when photographing a person Switch to a center auto-focus point, and aim that point at the person s head Press the shutter halfway to achieve focus, and then compose and shoot the picture The person s face will be in perfect focus in the resulting image
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Select an Auto-Focus Mode
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Press your camera s focus mode button Choose the desired auto-focus mode Alternatively, you may need to use the camera menu to change focus modes Refer to your camera manual for detailed instructions Compose and shoot the picture
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Focus On an Off-Center Subject
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If the camera is unable to achieve focus in low light conditions, momentarily shine a penlight on the area you want the camera to focus on After focus has been achieved, turn off the penlight and take the picture Alternatively, you can switch to manual focus
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Switch to a single focus point Most cameras give you the option of switching to a single focus point in the center of the viewfinder Position your camera so that the subject you want in focus intersects the focus point Press the shutter button halfway to achieve focus
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Compose the scene with the shutter button still pressed halfway Press the shutter button fully to record the picture
Your camera may also have a mode that switches between one-shot focus and continuous focus Continuous focus is handy when you re photographing moving objects
Use Preset Shooting Modes
When you shoot a picture using your camera s automatic mode, the camera exposes the picture based on the scene lighting, the objects in the scene, and the scene colors This mode works well for average conditions However, when you re shooting pictures in adverse lighting conditions or shooting pictures of fast-moving objects, you ll have to switch to one of your camera s preset modes Table 2-2 lists the shooting modes you re likely to find on your camera mode dial
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SHOOTING MODE
DESCRIPTION
ICON
Close-up or macro Portrait
Enables you to shoot close-ups of subjects like flowers and butterflies Blurs the background to make the subject of your portrait the center of attention Used for scenic shots The camera chooses a lens aperture that keeps both near and distant objects in focus The camera selects a high shutter speed to freeze fast-moving objects and, when the shutter button is pressed halfway, continually focuses on the moving object Uses the flash to illuminate your subject and leaves the shutter open to record the ambient scenery You should mount your camera on a tripod when using this mode, as the slow shutter speed may cause blurring Your subject should remain perfectly still during the exposure Note that with some cameras, you access this shooting mode through a menu command
Landscape
Sports
Night portrait (or slow synch)
Table 2-2: Choosing a Shooting Mode to Suit Your Scene
Remember to check your camera dial when you take the next picture to ensure that you re working with the desired shooting mode For example, if you switch to portrait mode when shooting a portrait of someone and forget to change your camera dial to landscape when
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