Head First HTML and CSS (五)

1. differences among JPEG PNG and GIF

   
   

2. img element
   

   

3. alt attribute
   

   
   

4. width and 'height'
   

   

5. PPI

pixel per inch

6. resize the img

use photoshop elements

7. thumbnails 缩略图

8. make links out of images

   
   

9. matte