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CREATING AND MAINTAINING WEB SITES
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Internet: The Complete Reference
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will not be partially transparent Dithering allows you to sprinkle transparent pixels in various proportions among the opaque pixels to achieve partial transparency The image palette, however, must not have any colors available between the foreground and background color for this effect to work, or else an intermediate, nontransparent color will be introduced Dithering is a double-edged sword for transparency If given a dithered image, try to obtain the undithered original so that the option to dither is yours You can avoid dithering an image by careful palette control, as described in Optimizing Images for the Web, or by changing settings in your graphics program If you have problems with an image because it has non-uniform colors, dithering, or any of the other reasons just listed, you may be able to clean up the image See Optimizing for Quality in the next section for suggestions
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Creating good web graphics is mainly a matter of balancing download speed and image quality If you aim for speed, you reduce the number of colors and the amount of detail an image can contain If you aim for color fidelity, use a highly detailed image, or add certain special effects, you may actually diminish image quality slightly for certain viewers of your web graphics and will almost certainly worsen downloading speed Certain optimizations help minimize the trade-off, and some graphics programs can do much of the optimization process for you Adobe Photoshop and Macromedia Fireworks both have tools that allow you to compare JPEG and GIF versions of an image and select the best quality or color palette for balancing this trade-off between download speed and image quality In Photoshop, optimize an image by choosing File | Save For Web In Fireworks, display the Export Preview dialog box by choosing File | Export Preview These dialog boxes are illustrated in Figures 26-1 (Photoshop) and 26-2 (Fireworks) The quality problems that you get in the normal course of creating web graphics are subtle (Too subtle, even, to be visible in illustrations in this book) For casual web sites, sizing your image properly and choosing GIF or JPEG appropriately is enough Only for professional or business web sites do you usually need to consider doing more
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Images need to download fast, or people won t wait for them before moving to another page Download speed is essentially a matter of small file size and reusing images where possible Four principal factors affect file size, as follows: I Choice of format (GIF, JPEG, or PNG), and JPEG quality (Refer to Graphics File Formats for the Web earlier in this chapter for a discussion of format issues) I Image dimensions I Image content I Number of colors This section focuses on the last three factors in file size: dimensions, content, and colors
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26:
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Figure 26-1
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The Save For Web dialog box in Adobe Photoshop helps you balance download speed and image quality
Reuse images where possible to save download time Browsers don t download the same image file more than once in any given browsing session, even if the image (such as a button, bullet, or icon) is repeated within or among your web pages Some web page development tools (especially word processors), however, create a separate file for each instance of an identical bullet or icon You may need to edit the HTML file to ensure that all the IMG tags for the bullet or icon refer to the same image file
CREATING AND MAINTAINING WEB SITES
Minimizing Image Dimensions
One important way to keep files small is to use the smallest practical image height and width (in pixels) If you reduce both height and width by half, for example, most image files diminish in size to about one-quarter of the original file size and download from the Web in one-quarter of the time For drawings, where images are stored in vector format, image dimensions don t matter until you convert the image to bitmap format (GIF or JPEG) You obtain best results by making the image the right size from the start, although you can also reduce a larger image (Going the other direction, enlarging a smaller
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