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

Generation QR Code in Software 2: Understanding Exposure

CHAPTER 2: Understanding Exposure
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FIGURE 2-10
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This wolf is lit differently than the rest of the scene, so a spot meter is the easiest way to accurately expose the wolf s fur
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When to Take Control
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As I mentioned at the outset, you may often be perfectly satisfied with the results you can get from the automatic exposure controls in your camera But there will be times when you can do better on your own Keep your eyes peeled for situations like those described next
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Very Bright Sunlight
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Very bright sun can overwhelm your camera, especially if the scene is filled with brightly colored clothing, reflective surfaces, or other tricky subjects You can reduce the exposure for better effects Underexpose the scene by EV 1 for starters, and see if that helps
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Backlit Subjects
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If you are taking a picture of someone or something and the sun is behind the subject, you re usually in trouble the bright background will cause the camera to underexpose the scene That means the subject itself will look like it s in shadow You ll get this if you follow the old (and very wrong) rule to put the sun behind the person you re photographing The best way to shoot
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How to Do Everything with Your Digital Camera
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an outdoor portrait is to put the sun over your shoulder Nonetheless, if you find the sun behind your subject, overexpose the scene, such as with an EV +1 My clever tech editor, David Huss, says that he frequently wears white clothing essentially turning his own body into a giant reflector allowing him to put the subject between himself and the sun
Low Light
In low light, such as at night, indoors, or under thick cloud cover, you can often get better results by overexposing the scene slightly, such as with an EV +1 Vary the EV level depending on how dark the scene actually is
Consider Exposure When Taking a Picture
Most of the time, you can just compose your shot and press the shutter release But don t forget to adjust the exposure when necessary Use this decision process:
I Do I need to adjust the depth of field that is, make the background more or less
sharp compared to the foreground If yes, adjust the aperture/shutter or use the aperture priority mode, discussed in detail in 3
I Do I need to change the shutter speed to depict motion in the picture If yes, again
try to adjust the aperture/shutter, or instead use the shutter priority mode, discussed in detail in 3
I Is the scene significantly brighter or darker than the camera is designed for If it
is, under- or overexpose the scene
I Is the subject backlit, such as with the sun behind Overexpose the scene I Is the subject especially bright, such as on fresh, bright snow Try underexposing I Do I want to expose the scene based on the lighting in a specific part of the scene
If so, use a spot meter or just lock in the exposure for that part of the picture and recompose the scene
3
Composition Essentials
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How to Do Everything with Your Digital Camera
How to
I I I I I I I I I I
Use the rules of composition to take compelling photos Take less cluttered snapshots by emphasizing a focal point Take interesting photos with the rule of thirds Avoid cropping out important pixels by filling the frame Use lines and symmetry for artistic images Break the rules for more engaging photos Understand the relationships among shutter, aperture, and depth of field Employ depth of field for pictures that emphasize the subject Zoom a lens to achieve the right field of view Apply rules of composition to common photographic situations
What does it take to take a good picture Certainly, it requires more than a mastery of your camera s various controls If that were all you needed, anyone who knew how to read a camera manual could be Ansel Adams No, taking good pictures demands a little creativity and a touch of artistry Perhaps more importantly, though, it takes a solid understanding of the rules of photographic composition and some knowledge which you can acquire as you get better at photography of when it s okay to break those rules Composition is all about how you arrange the subjects in a picture and how you translate what is in your mind s eye or even right in front of you into a photograph After all, the camera sees things very differently than you do, and in order to take great photographs you have to understand that and learn how to see the world the way your camera sees it Taking a picture with a digital camera is really no different from taking a picture with a 35mm camera That s why in this chapter we will be talking about the rules of composition: what they are, how to use them, and how to break them If you are already an accomplished photographer and you re reading this book to make the transition to digital photography, you may not need most of what I offer in this chapter But if you re not an expert, I welcome you to study this chapter It is only through an understanding of composition that your images will go from snapshots the ones that bring comments like What a nice picture of a cat! to potential works of art
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