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.
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