 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. |
