Note, however, that results vary depending on the image. As you can probably tell,
JPEG does an excellent job of compression so that even a substantial degree of compression has only minimal
visible impact. Keep in mind that every graphic has its own reaction to compression.
FIGURE 9-2
JPEG compression can save your Web visitors significant download time with little loss of image quality.
With the JPEG image-compression algorithm, the initial elements removed from a compressed
image are the least noticeable. Subtle variations in brightness and hue are the first to disappear.
When possible, preview your image in your graphics program while adjusting the compression level to
observe the changes. With additional compression, the image grows darker and less varied in its color range.
If you use Fireworks as your graphics editor, you can optimize image file size without leaving Dreamweaver.
See Chapter 24 to learn more.
With JPEGs, what is compressed for storage must be uncompressed for viewing. When a visitor??™s browser
accesses a JPEG picture on your Web page, the image must first be downloaded to the browser and then
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uncompressed before it can be viewed. This dual process adds additional time to the Web-browsing
process, but it is time well spent for photographic images.
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