Tham khảo tài liệu 'tự học html và css trong 1 giờ - part 29', công nghệ thông tin, đồ họa - thiết kế - flash phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 256 lesson 9 Adding Images Color and Backgrounds align texttop Allows greater control over the alignment of an inline align absmiddle image and the text surrounding it. vspace Defines the amount of space between an image hspace and the text surrounding it. border Defines the width of the border around an image with or without a link . border 0 hides the border altogether. In addition to images you can add color to the background and the text of a page using learned the CSS properties color background-color and background which enable you to specify colors for your page without using deprecated tags. You also learned about the HTML attributes that were once used to specify colors before CSS was widely supported. Workshop Now that you know how to add images and color to your pages you can really get creative. This workshop will help you remember some of the most important points about using images and color on your pages. Q A Q What s the difference between a GIF image and a JPEG image Is there any rule of thumb that defines when you should use one format rather than the other A As a rule you should use GIF files when images contain 256 colors or fewer. Some good examples are cartoon art clip art black-and-white images and images with many solid color areas. You ll also need to use GIF files if you want your images to contain transparent areas or if you want to create an animation that doesn t require a special plug-in or browser helper. Remember to use your imageediting software to reduce the number of colors in the image palettes whenever possible because this also reduces the size of the file. JPEG images are best for photographic-quality or high-resolution 3D rendered graphics because they can display true-color images to great effect. Most imageediting programs enable you to specify how much to compress a JPEG image. The size of the file decreases the more an image is compressed however compression can also deteriorate the quality and appearance of the .
