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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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