barcode dll for vb net Setting the Image Display Size in Software

Creation ANSI/AIM Code 128 in Software Setting the Image Display Size

Setting the Image Display Size
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When you prepare a digital photo for screen display, you can t set picture size the same way you do for printed photos. The next few sections explain why a different approach is necessary and walk you through the steps involved in establishing the size of your screen pictures.
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Screen Pictures and ppi
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9 explains how output resolution, measured in ppi (pixels per inch), affects both print size and print quality. For screen images, output resolution is completely irrelevant. This concept is critical, so let me repeat: Output resolution plays no role in either the size or quality of screen images. I know that you ve heard many people say that you must set the output resolution of web or e-mail pictures to 96 ppi or 72 ppi. But this recommendation is an example of bad information spreading so widely that people perceive it as truth. (The sidebar Tracing the Origins of the 96/72 ppi Myth explains how the notion originated.) Here s the real story: A display device, whether it s a computer monitor, television screen, or multimedia projector, builds everything that you see on-screen out of pixels, just like a digital camera. When presenting a digital picture, the device pays no attention to the output resolution value that you may have established in your photo editor. Instead, it simply uses one screen pixel to reproduce each image pixel. Figure 10.1 proves the point. Both images on the web page have 300 horizontal pixels and 150 vertical pixels. Before adding the pictures to the web page, I used my photo editor to set the output resolution of the left image to 96 ppi and the right image to 300 ppi. As you can see, the two pictures display at the same size. Notice, too, that a higher output resolution does not improve image quality. Nor would adding more pixels affect quality it would simply increase the size of the picture on-screen. The only instance in which the one-to-one relationship between screen and image pixels changes is when you open the picture in a photo editor and use a zoom tool to magnify the image. You must set the zoom magnification to 100 percent to view the image at the size that it will appear when placed on a web page, sent via e-mail, or used for some other on-screen purpose. In many photo editors, this 100-percent view is called Actual Pixels. If you view the picture on another monitor, however, it may display at a different size than the unmagnified size you see on your screen. This happens because the size of the screen pixels used to display the image depends on the screen resolution, as explained in the next section.
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CHAPTER 10: Putting Pictures on the Screen
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FIGURE 10.1 Output resolution has no effect on display size; all that matters is the number of horizontal and vertical pixels.
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How Screen Resolution Affects Display Size
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To emphasize an earlier point: Output resolution (ppi) does not affect the size of a screen image. The display size depends only on the following two factors:
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The image pixel dimensions (pixels wide by pixels tall) The resolution of the screen itself
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As I mentioned in the preceding section, the phrase screen pixels refers to the display device pixels. Screen resolution refers to the total number of screen pixels. Screen resolution, like digital camera resolution, is stated in terms of pixel dimensions. On a computer monitor, the user can adjust screen resolution. Most systems offer a range of resolution settings; standard options for a 17-inch monitor, for example, are 640 480, 800 600, 1024 768, 1280 1024, and 1600 1200. In Windows, you set resolution via the Display Properties dialog box (right-click an empty area of the desktop and choose Properties). On a Mac, you access resolution controls by choosing Control Panels | Monitors from the Apple menu.
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At a high screen resolution, images display at a smaller size than they do at a low screen resolution. As an example, compare Figures 10.2 and 10.3. For both figures, I set the Windows wallpaper (desktop background) to display a 640 480-pixel photograph. The first figure shows how the desktop looks when the screen resolution is 640 480. Because of the one-to-one relationship between screen and image FIGURE 10.2 A 640 480-pixel image fills the monitor when the screen pixels, the picture fills the resolution is also 640 480. entire screen. (The bottom of the picture is hidden by the Windows taskbar, which I left visible so that you could tell you were looking at a computer screen.) Figure 10.3 shows that same 640 480-pixel image on a monitor running at a screen resolution of 800 600. At that resolution, the number of screen pixels increases, which means smaller pixels. Your 640 480-pixel image appears smaller because the screen pixels used to display it are smaller. And, of course, your photo consumes only 640 of the 800 available horizontal screen pixels, and 480 of the 600 vertical pixels, so FIGURE 10.3 Displayed on a monitor set to a screen resolution of 800 600, the 640 480-pixel photo no longer consumes the entire screen. the image no longer fills the entire screen.
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