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Choose JPEG for everyday pictures. As long as you use a light compression setting, you can expect good image quality and reasonable file sizes. And you get the benefit of being able to distribute photos online immediately if needed. For situations that demand the highest possible image quality, choose TIFF, assuming that you have enough camera memory to store the larger files. You will need to create a copy of the picture in the JPEG format for online sharing, however. (Some cameras can make the copies for you automatically, which is a great time-saver.)
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CHAPTER 2: Exploring Creative Controls
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As for RAW, I rarely use it because a) it s a nuisance, and b) I m not a fanatic about recording pure images. The only situation in which I d consider RAW is when I m working with a camera that is heavy-handed with image sharpening. For more about that topic, read Features to Ignore, at the end of this chapter.
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Many cameras record details about camera settings, such as shutter speed and lens focal length, in a hidden part of a JPEG file. You can view this data dubbed EXIF metadata in some image-cataloging programs and stand-alone EXIF viewers. See 1 for more information.
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Digital cameras, like point-and-shoot film cameras and some film single-lens reflex (SLR) cameras, offer programmed autoexposure AE for short. In this mode, the camera automatically chooses the proper combination of aperture (f-stop) and shutter speed needed to produce a good exposure. (See 1 if you re new to these terms.) In addition to programmed AE, advanced cameras typically provide two variations on the theme:
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Aperture-priority AE
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Chooses the shutter speed automatically after you Sets the aperture automatically based on your selected
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set the aperture.
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Shutter-priority AE
shutter speed. Your camera may also offer a manual exposure setting that gives you complete control over both aperture and shutter speed.
When you use any autoexposure camera, you must press the shutter button in a certain way for the exposure mechanism to work properly. After framing the shot, press the shutter button halfway down and wait for the camera to signal you that it s analyzed the scene usually, by sounding a beep or displaying a light near the viewfinder. Then press the button the rest of the way down to capture the image.
Creative Impact
Just as a movie director uses lighting to set the mood of a scene, you can use your camera s exposure controls to convey a certain feeling in the image. You can purposely underexpose an image to give the subject an air of mystery, for example. Beyond the obvious balance of light and dark in a photograph, however, you can alter other aspects of an image by taking control of aperture and shutter speed.
Shoot Like a Pro!
For example, you can adjust depth of field, or the range of the picture that s in sharp focus, by changing the aperture. The larger the aperture, the smaller the depth of field. As an example, see Figure 2.6, shown in color at the top of Page 13 in the color insert. Depth-of-field shifts get more noticeable as you zoom in or bring the camera closer to the subject, as illustrated by the lower images in the color insert.
f/2.8 f/11
FIGURE 2.6 A large aperture produces shorter depth of field (left); a small aperture brings a greater area into sharp focus (right).
In addition, when photographing a moving subject, you can use a fast shutter speed to freeze action. Alternatively, you can emphasize motion by using a slow shutter, which blurs the subject. For two illustrations, see Secrets #6 and #14 in the color insert.
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