how to generate barcode in vb.net 2010 Exploring Creative Controls in Software

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2 Exploring Creative Controls
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If you ve ever tuned in to the Food Network on TV, you may have caught an episode of Iron Chef, a Japaneselanguage import in which two famous chefs do culinary battle. The participants are challenged to combine a random assortment of ingredients into a gourmet feast for a panel of celebrity taste-testers. As the contestants chop, saut , and sauce, commentators describe the action in dramatic, play-by-play fashion. The dishes, which include such delicacies as octopus risotto and eel la mode, don t always appeal to my American palette as much as they seem to enchant the celebrity judges, but the show is good, campy fun nonetheless. Even better, it provides the perfect analogy to describe this chapter, thus lending credence to my claim that when I m watching TV, I m not wasting time but in fact working. You see, the first thing that the Iron Chef competitors do is assess the ingredients they ve been given to see what goodies they may be able to prepare. Similarly, your first step as a photographer should be to evaluate your subject, the setting, and your camera s capabilities. You then can figure out how to bring those components together to create a tasty visual treat. Later chapters detail techniques related to specific subjects and surroundings. This chapter provides an overview of all the major digital camera controls, explaining the creative impact of each option and offering my recommendation about which settings to use in various shooting scenarios. As you read, you may want to have your camera manual handy so that you can confirm whether your camera offers a particular option, and if so, how you activate that feature.
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The resolution control determines the number of pixels that your camera uses to produce a picture. Your camera likely offers three or more resolution settings, each delivering a different pixel count. You may see your options presented in terms of pixel dimensions, such as 2288 1712, with the horizontal pixel count listed first, followed by the number of vertical pixels. However, some manufacturers refer to the total number of pixels when labeling resolution options, using the term megapixel to mean one million pixels. For example, if you multiply 2288 1712 pixels, you get roughly 3.9 million pixels, or 3.9 megapixels (which the folks in the camera marketing department round up to 4 megapixels).
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If you re an experienced film photographer, you know that the larger the film negative, the more you can enlarge the photo without losing sharpness and detail. You can make a similar connection between pixel count and print size. The more pixels you capture, the larger you can print your photo without a noticeable loss of quality, as illustrated by Figures 2.1 and 2.2.
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3 megapixels, 1.3MB 1 megapixel, 620K
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FIGURE 2.1 At snapshot size, the 3-megapixel tulip (left) doesn t look much different from the 1-megapixel version (right).
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CHAPTER 2: Exploring Creative Controls
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1 megapixel
3 megapixel
FIGURE 2.2 When the print size is doubled, the 3-megapixel image (left) offers significantly higher quality than the 1-megapixel photo (right).
I shot both tulip pictures with the same camera. For the left images in both figures, I used the camera s 3-megapixel setting. For the right images, I reduced the camera resolution to 1 megapixel. When printed at snapshot size, as in Figure 2.1, both images are perfectly acceptable, although small details such as the dewdrops appear slightly sharper in the 3-megapixel version. But in Figure 2.2, which shows a portion of both pictures as they would appear if the original were enlarged to 5 7 inches, the 1-megapixel file doesn t hold up. A dearth of pixels leads to a stair-stepped appearance along diagonal and curved lines, and subtle details are lost. The result is a picture that appears jagged in some areas and blurry in others. On the down side, more pixels means larger file sizes, so you can fit fewer pictures in a given amount of camera memory. In addition, larger files take longer to process in a photo-editing program. As a point of comparison, the 1-megapixel tulip in Figure 2.1 has a file size of roughly 620K(kilobytes); the 3-megapixel version, 1300K, which equals 1.3MB (megabytes). Note that file compression, explained next, also has an impact on file size; I shot both images at the same compression setting. Although good printed output requires a hefty pixel count, the story changes for pictures displayed on a computer monitor, television, or digital projector. For screen images, the number of pixels does not affect picture quality, just display size. At maximum, the image pixel dimensions should equal the screen resolution (640 480, 800 600, and so on).
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