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GIF (Graphic Interchange Format) files use a maximum
of 256 colors, and are best for displaying noncontinuous-tone
images or those with large areas of flat colors, such as navigation
bars, buttons, icons, logos, or other images with uniform colors
and tones.
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.
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