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 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抯 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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