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To reduce download times, you can also use an image editing program to create two versions of an image, one in full color and the other with a reduced color palette The Web browser can then display the reduced-color image as a placeholder until the full-color version downloads
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Many graphic applications allow you to open a graphic and save it in another format For example, you can open a JPEG file in Photoshop and then save the image as a GIF file Use this method if you want to create an animation, since only GIF files can be animated When you convert a file from one format to another, the converted image may not look like the original For example, if you convert a JPEG photograph to a GIF, the resulting image will not have as many colors and may look distinctly different, as shown in Figure 82
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There are two basic types of graphics: raster and vector The GIF graphic file format works best for line art and simple drawings The JPEG graphic file format works best for photographs Compression schemes reduce an image s download time but also diminish its quality
What Did You Learn
1 Define raster graphic, vector graphic, Graphic Interchange Format (GIF), Joint Photographic Experts Group (JPEG), Bitmap (BMP), Portable Network Graphic (PNG), lossless compression, lossy compression 2 Compare and Contrast raster graphics and vector graphics
Critical Thinking
3 Evaluate Why should you consider an image s download time when creating Web pages 4 Make Decisions You are creating a Web site for a new art gallery What issues will you need to consider when choosing graphic file formats for this site
Apply It!
Convert File Formats Open a graphics application, such as Macromedia Fireworks Open a JPEG image such as bikejpg Save the image as a GIF file Compare the quality of the two images and the sizes of the two files
Using Web Graphics
SECTION 82 OBTAINING AND MODIFYING GRAPHICS
Focus on Reading
Read to Find Out
The main purpose of this section is to explain how to obtain and modify graphics As you read, stop and make sure you understand the key terms cropping, resizing, and resampling Read to find out how and why Web designers make changes to graphics
Main Ideas
You can insert pre-made graphics or use tools to create images for your Web pages Always check the terms of use before downloading pre-made graphics You must use image editing programs to make substantial changes to graphics
Key Terms
dots per inch (dpi) image editing program draw program inline graphic cropping resizing aspect ratio resampling
Reading Strategy
Identify five ways in which you can obtain or create graphics Use a web diagram like the one below (also available online)
Ways to Obtain or Create Graphics
Images on Web sites come from many sources In this section, you will learn about tools and resources you can use to create and modify graphics
Obtaining Graphics
What are the two main ways of acquiring graphics
Activity 81 Locate Graphics Online Get more ideas for locating images for your Web pages by visiting WebDesignDWglencoecom
There are two main ways that you can acquire the graphics you need for your Web pages You can obtain premade graphics and insert them directly into your Web pages Or, you can use tools to create your own graphic files
Using Premade Graphics
One of the easiest ways to add images to your Web pages is to use premade graphics Premade graphics are readily available both online and from other sources
Troubleshooting Some sites spell Clip Art as one word: Clipart Try both variations when using a search tool to look for Clip Art on the Web
Locating Graphics Online The Web is an excellent source of premade graphics You can use a search engine to locate the exact image you want Most sites organize their images by categories such as nature, travel, sports, and work When you find an image that you want, right-click it and select Save Picture As from the menu to save the image to your hard drive Using Clip Art Many software applications include large image collections that you can insert on your pages You can also purchase commercial image packages These packages provide both general image collections and collections built around specific themes or events Clip collections may include illustrations, photos, sound effects, and short video clips
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