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Chapter 8 - Graphics and Color REPUBLIC OF NICARAGUA
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1. What are the three image file formats you can use on a Web site? GIF, JPG, and PNG 2. Which file formats support 24-bit color? JPG and PNG 3. Explain a file’s color depth control. The fewer colors you use, the greater the compression and the smaller the file size. However, limited color depth means that files cannot adequately display photographs or more complex graphics that have gradations of color, such as shadows and feathering. 4. How many colors does GIF support? 256 colors 5. What is the browser-safe palette? The 216 nondithering colors that are shared by PCs and Macintoshes are called the Web palette or browser-safe colors. 6. What is lossless file compression? Lossless compression technique means that no color information is discarded when the image is compressed. 7. Which file formats support transparency? GIF and PNG 8. What are the drawbacks of using animated GIFs? Users may find it annoying because they are repetitive and distract from the page content. 9. Explain lossy image compression. Lossy compression routines are specially designed for photographic images: when the image is compressed, some color information is discarded, resulting in a loss of quality from the original image. 10. What image characteristics can you control using the JPG format? When you create the JPG file, you can balance the amount of compression versus the resulting image quality manually. 11. What are some options for acquiring images for your site? From a graphics professional you hire to create and prepare your images, stock photo collections, with a digital camera, scanner, or public domain Web sites. 12. Which image format should you use for a two-color company logo? GIF 13. Which image format should you use for a photograph? JPG 14. What three attributes should you always include in the image tag? Why? src, alt, and title 15. How many layers can you work with when designing pages? 3 16. What are the three different ways to express color values in CSS? Background color layer, background image layer, content layer 17. How is the default border color of an element determined? By default, the element’s border is the same color as the element content. 18. What are the three special selectors that let you change link colors? link, active, and visited 19. To what type of elements can you apply a background color? Any element on a Web page 20. What is the default background image behavior? Tile across the background
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