JPEG (Joint Photographic Experts Group) file format is the superior format for photographic or continuous-tone images, because JPEG files can contain millions of colors.

As the quality of a JPEG file increases, so does the file size and the file download time. You can often strike a good balance between the quality of the image and the file size by compressing a JPEG file.

PNG (Portable Network Group) file format is a patent-free replacement for GIFs that includes support for indexed-color, grayscale, and true-color images, and alpha channel support for transparency.

PNG is the native file format of Macromedia Fireworks MX. PNG files retain all the original layer, vector, color, and effects information (such as drop shadows), and all elements are fully editable at all times.

Files must have the .png file extension to be recognized as PNG files by Macromedia Dreamweaver MX.

For example, the most common frame layout has one frame in the top row (where the company’s logo appears) and two frames in the bottom row (a navigation frame and a content frame).

This layout requires a nested frameset: a two-row frameset, with a two-column frameset nested in the second row.
 

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