Scaling an Image
You can change the display size of an image just by specifying a new height and width in pixels. This is an easy way to have large images on your page without long loading times. Beware, though, if you enlarge your pictures too much, they'll be grainy and ugly.
17. At its original size of 396 by 439 pixels, the image is way too big on the page.
To scale an image:
18. Don't specify pixels with the numbers. Just use bare numbers.
19. The image appears at half its original size. It's important to note, however, that it takes the same time to load as before. After all, it's the same file.