9: IMAGES in Visual Studio .NET

Encoder QR Code 2d barcode in Visual Studio .NET 9: IMAGES
CHAPTER 9: IMAGES
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Figure 9-4: Enlarged JPG digital photo using HTML5 attributes to enlarge and shrink.
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To find the width and height of a graphic, use the mouse pointer to select the image file and then In Windows, right-click it and select Properties Details and read the Width and Height values. You can find the dimensions of a graphic file by moving the mouse over the file. In Mac OS X, Ctrl+click the image file and select Get Info. In the More Info section view the Dimensions showing Width x Height. Most Web tools, such as Dreamweaver, provide code hinting at the image dimensions. Likewise, virtually all graphic-editing programs show the image s dimensions when the file is loaded.
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When discussing an image s size, two different meanings are used: The size of the file in terms of its dimensions The number of bytes it takes up Usually, in this discussion the context should make it clear which sense of size is being used, but for the most part, the term size refers to the number of bytes in a file, and dimensions refers to the size of the image on the screen. Adobe Photoshop is a commonly used application for making adjustments to graphic size and quality. Further, Photoshop provides visual information that designers and developers can use to decide how much byte reduction the graphic can take before its appearance suffers. Figures 9-5 and 9-9 show this process. (Figures 9-6 through 9-8 show information about the files and how they appear on a Web page.)
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Figure 9-5: Image and size information display in four-way view.
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CHAPTER 9: IMAGES
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Changing JPEG le sizes
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Beginning with a very large TIFF file that must be converted to either a PNG, JPEG, or GIF file, the file-editing process begins with three levels of quality maximum, medium, and low. Figure 9-5 shows the original TIFF file and three JPEG renderings. The original TIFF image in the top-left corner is over a half a megabyte, and it needs to be slimmed down significantly and converted into a format that HTML5 browsers can read. The top-right figure in JPEG format is set to the maximum quality 100. On the bottom row, the bottom-left figure is low quality set to 2, and the bottom-right figure is considered medium quality, set at 60. The smallest Web file is only 8.6K and the largest is 127.1K. A quick glance shows very little difference with this particular image. To get a more definitive idea, the two extremes of Web quality settings are saved to disk. Then (on a Macintosh) each is viewed for the size settings as shown in Figure 9-6.
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Figure 9-6: Checking image le properties.
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In looking at Figure 9-6, you can see that both have identical dimensions (432 x 343), but one has 12 KB of information and the other has 139 KB. The reason for beginning adjustments by comparing the best and the worst quality as implied in the file size is that visual differences are more apparent. Perception studies have found that examining minute differences tends to gloss over those differences, whereas extreme differences are clear, so when you begin making adjustments, it s better to start with the big differences. Figure 9-7 shows the two files on a Web page.
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PART III: MEDIA IN HTML5
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Figure 9-7: High-quality and low-quality JPEG les on a Web page.
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As you can see, the lowest-quality image (left) and highest-quality image (right) are very similar. In the context of other materials on a Web page, some quality differences may appear. However, images that have the characteristics of those two shown in Figure 9-7 don t suffer much in appearance on the Web when file size is reduced. 184 A bigger difference with JPEG files sizes can be seen with digital photos. In Figure 9-8, the photo on the left is the lowest quality (8K) and the one on the right (115K) is the highest, with corresponding file sizes.
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