barcode dll for vb net Raise the ISO setting, which is akin to using a higher ISO film. As explained in Software

Maker USS Code 128 in Software Raise the ISO setting, which is akin to using a higher ISO film. As explained

Raise the ISO setting, which is akin to using a higher ISO film. As explained
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in the next section, however, this solution sacrifices some image quality.
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Increase the aperture size (by selecting a lower f-stop number) to allow more light
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into the camera. This choice also changes depth of field, as illustrated by Page 13 of the color insert.
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Select a slower shutter speed, which increases the amount of time that the image
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sensor can gather light. The upcoming section Shooting Long Exposures offers some tips on this tactic.
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If you are working in autoexposure mode, you may also be able to tweak exposure by increasing your camera s EV (exposure value) compensation setting, if available. Your camera will then adjust aperture or shutter speed or both to produce an exposure that s brighter than what the camera s autoexposure meter suggests is correct. (Some cameras also raise ISO automatically.) Check out 2 and Pages 9 and 17 of the color insert for more information about EV compensation.
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Adjusting Light Sensitivity (ISO)
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As I mentioned in the introduction to this chapter, the image sensors on most digital cameras have a light sensitivity equivalent to ISO 100 film, which means that they respond best to brightly lit scenes. In an attempt to give photographers a better chance
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CHAPTER 6: Getting the Tough Shot: Low-Light and Action Photography
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of recording a good image in dim lighting, newer cameras offer an ISO control that adjusts the camera s light sensitivity. The ISO control settings typically match the ISO ratings on standard consumer films: ISO 100, 200, 400, and 800. The higher the number, the greater the camera s sensitivity to light. With a higher ISO film also called a faster film in photography lingo you can get a good exposure with less light. In bright light, the increased light sensitivity enables you to work with a smaller aperture (higher f-stop number) or faster shutter speed than when using a lower ISO film. If you re an experienced film photographer, you know that increased light sensitivity comes at a cost, however. As you move up the ISO scale, you increase grain a visual defect that looks like someone sprinkled sand over your photo. The same tradeoff exists with digital cameras, only in the digital world, the resulting defect looks like speckles of random color and is known as noise. You can see examples of how ISO affects both exposure and noise on Page 2 of the color insert. Figure 6.1 shows the detail from the ISO 100 and ISO 800 examples. The amount of additional noise produced when you increase ISO varies from camera to camera; your model may produce significantly more or less noise than what you see in these examples.
ISO 100 ISO 800
FIGURE 6.1 Raising the ISO setting results in a brighter exposure but also introduces noise, giving the image a speckled look.
How much image quality you should sacrifice for increased light sensitivity is purely a personal creative choice. As you debate the issue, keep these points in mind:
If you re shooting in programmed autoexposure (AE) mode, the camera
automatically adapts aperture and shutter speed to your ISO setting.
Shoot Like a Pro!
In aperture-priority AE, the camera changes shutter speed only; in shutter-priority AE, the camera adjusts aperture only. Remember that the camera can do only so much in this regard, however. If you re shooting in extremely dim lighting, you may not be able to record a good image at a low ISO even if the camera opens the aperture all the way and uses the slowest available shutter speed. (You may be able to brighten the exposure to an acceptable degree after the fact in your photo editor; for a brief lesson, see the upcoming How-To sidebar, Adjust Exposure with a Levels Filter. )
Noise is typically most apparent in shadows and areas of flat color, such as the
sky in the color insert examples. (This is actually a ceiling painted to look like a sky, but the noise impact is the same.) To be fair, however, at a lower ISO, you may lose all detail in the shadows. Areas that should contain a blend of dark gray to black pixels may all be recorded as black, as you can see in the window archways in the ISO 100 example in Figure 6.1. What can I say life s a series of tradeoffs, eh
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