generate 2d barcode vb.net 2: Understanding Exposure in Software

Encoding QR Code ISO/IEC18004 in Software 2: Understanding Exposure

CHAPTER 2: Understanding Exposure
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you want In essence, what this does is allow you to turn up or turn down your camera s sensitivity to light
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Use ISO for Exposure Control
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You can use the ISO control built into your digital camera to vary its sensitivity to light and thus mimic the effect of using different grades of 35mm film This can come in handy in a number of situations, such as when you re shooting in particularly high or low light levels Remember a few key facts about your camera s ISO ratings, though:
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I It s not a real ISO adjustment, in the sense that your camera doesn t have real film Each
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camera maker has a somewhat different way of implementing this feature, but they all use ISO numbers since that s comparable to 35mm film, which most people are at least a little familiar with
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I Don t leave your camera set at the highest ISO all the time Some folks think that by
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setting their cameras to the highest sensitivity, they ll be prepared for anything and won t have to muck with the camera menu when they re on the go, trying to take pictures In reality, boosting your CCD s sensitivity to light also increases the amount of digital noise you re capturing More ISO means more fringing, artifacts, and digital detritus Sometimes that s unavoidable, but stick with the lowest ISO value you can get away with most of the time
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Change the ISO Setting
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If you find yourself in a situation in which the lighting isn t quite right for your picture, it s time to bump up the camera s ISO value Remember that not all cameras come with ISO adjustments, so review your user manual to see if this applies to your particular model Figure 2-5 shows a typical ISO adjustment; you ll probably find it in the onscreen menu system, displayed in the LCD screen on the back of your camera Here are some situations in which you might need to increase the ISO:
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I You re shooting in a low-light situation, such as early evening or indoors
Naturallight photos have a certain appeal, and by increasing the light sensitivity of your camera you may be able to shoot a picture without using the flash at all Using natural light can eliminate harsh shadows and produce more natural colors
I Your subject is too far away for the flash to have any effect During the day you
might be outdoors and want to take a picture of something, but there s not quite enough light such as in winter or during very overcast conditions Your camera wants to use a flash, but your subject is just too far away As you ll see in 4, the flash on your digital camera has a very limited range So to properly expose your picture, you need to use faster film that is, increase the camera s ISO setting
I You re shooting at night Most digital cameras have very little ability to take pictures
at night or in near total darkness A few models can extend the shutter to about half of a
How to Do Everything with Your Digital Camera
FIGURE 2-5
A typical ISO adjustment on a digital camera
second, but that s about it As a result, if you want to capture anything at all with a night shot, you ll need to increase the camera s light sensitivity to maximum If night photography interests you, investigate what I refer to as performance digital cameras cameras that include manually adjustable shutter speeds and apertures Cameras like the Nikon CoolPix 995, the Olympus C-4040, and the Canon PowerShot G2 are the sorts of models that are better equipped to deal with very low light such as you ll encounter at night Using more full-featured cameras let you perform long exposures for light trails, glowing illuminated signage, and other special effects
Perfecting Shots with Aperture and Shutter
Let s return to the idea of aperture and shutter speed again for a moment As observed earlier in this chapter, they re essential ingredients to creating good pictures Of course, with most digital cameras, you rarely have to worry about setting shutter speed and aperture size at all for typical photography
How Cameras Choose Aperture and Shutter Speed
Here s what usually happens: when you apply pressure to the camera s shutter release, the camera s microcomputer samples the scene in front of the lens and determines how much light is needed to adequately expose the scene With most digicams, the camera selects a shutter speed and aperture combination that is sufficient to get the job done But, you might be wondering, how
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