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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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