barcode dll for vb net Tweaking Camera Settings for Close-up Work in Software

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Tweaking Camera Settings for Close-up Work
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Along with the aforementioned digital zoom, a few other camera settings call for special consideration when you re doing close-up photography. The next few sections explore the most critical of these options.
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Choosing Resolution and Compression
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When you re shooting important close-ups, use the highest resolution and lowest compression possible. Defects caused by too few pixels or too much compression are much more noticeable in close-up photos because it s easier for the eye to detect any interruption in the color or design of the subject. In the far-away tulip shot on Page 20 of the color insert, for example, you probably wouldn t be able to spot compression artifacts; they would be lost amid the jumble of shapes and colors. But in the close-up image, compression artifacts would have nowhere to hide.
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2 discusses resolution and compression in greater detail; see Pages 4 and 5 of the color insert for a look at resolution and compression defects.
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Focusing at Close Distances
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Depending on how close you want to get to your subject, you may need to switch to macro focusing mode. The universal symbol for macro mode is a tiny flower, as shown in Figure 5.2. Check your camera manual for the minimum and maximum camera-to-subject distance to use when working in macro mode; this range varies from camera to camera.
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Shoot Like a Pro!
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Here are a few additional tidbits to help you achieve sharp focusing at close range:
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If your camera has an optical zoom,
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you may not be able to use macro mode along the entire range of the zoom. Usually, the camera displays a symbol in the viewfinder or LCD monitor to let you know when you re at a focal length that permits macro focusing.
Additionally, the zoom position may
Macro button FIGURE 5.2 Your camera manual should state the minimum and maximum shooting distance for sharp images in macro mode.
affect the minimum close-focusing distance. Again, your camera manual should spell out the focusing distances for the various focal lengths available on your camera.
Throwing more light on your subject
can help your camera s autofocus mechanism do a better job. Lighting at close range can be difficult, however, because the camera can get in the way of the light source. For tips, see the section Lighting at Close Range, later in this chapter. If you have trouble with autofocusing, switch to manual focusing, if your camera offers it, and use a ruler to measure the lensto-subject distance precisely.
Many camera lenses produce the sharpest images at a medium aperture setting.
However, depth of field is shorter at a medium aperture than at a small aperture, so the range of the scene that is sharply focused will be more limited. Experiment to find out how different f-stops affect your camera s focusing abilities.
What appears to be faulty focus in an image may actually be a camera movement
problem. Any camera shake will register as a slight blur that will be especially noticeable in close-up shots. Use a tripod and snap the picture using the camera s self-timer mechanism to be sure that the camera is absolutely still during the exposure.
CHAPTER 5: Capturing Close-ups
Previewing Your Shots
When shooting close-ups, always check your framing in the camera s monitor instead of the viewfinder. The monitor more accurately represents what the camera lens sees. On most point-and-shoot cameras, the lens and the viewfinder operate independently, and the viewfinder has a slightly different angle on the scene than the lens. This disparity, known as parallax error, increases as you move closer to your subject. If you use very tight framing and compose the shot using the viewfinder, your image may not capture the entire subject, as shown in Figure 5.3. Although I could see the entire foreground flower through the camera viewfinder, the outer tips of some petals were actually beyond FIGURE 5.3 Although the entire foreground flower was the vision of the lens. visible in the camera viewfinder, the lens Some cameras force you to frame pictures recorded only the area shown here. using the monitor in macro mode. Your viewfinder may also display tiny lines that indicate the actual area that will be captured by the lens at a close distance. However, check your camera manual to be sure that those viewfinder markings indicate the framing area and not the area being evaluated by the camera s autoexposure or autofocus mechanism. If you own a high-end camera, it may have a through-the-lens (TTL) viewfinder. With this arrangement, the viewfinder and lens are supposed to be in perfect synch. Still, framing your shots using the monitor is a good idea because you get a clearer view of the image-to-be.
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