
Without
graphics the web would be a pretty boring
place. Sure, you could still convey your message
in plain text but it wouldn't be very exciting
and there would be nothing to make your website
stand out visually from all the others. Take
this site for example; everything you see above
the time and date stamp is graphical. The orange
bar, the background, the picture
of Deegie and me, and the main navigation links
to the left of our picture, are all graphical
(click HERE for
more about website design).
There
are basically two graphic formats that are
widely used on the web: and
.
Both are well suited for the web. Their compression
makes them small and fast loading.
The
JPEG (or JPG) format is great for photos because
it can incorporate millions of colors. That
means your photos will retain most of their
color and will look great on the web. JPEG
files use "lossy" compression which means redundant
or unneeded colors are discarded. When done
correctly this is not perceptible to
the human eye (click HERE for
more on using photos).
GIF
graphics are best used for icons, line drawings
and other graphics created with graphics
programs. They incorporate fewer colors than
JPEG files (256 or less), can have a transparent
background, and can be animated. GIF files
do not use lossy compression so all colors
are retained.
Even
though both formats work well on the web you
don't want to have too many on each page. The
more graphics on a page, the longer it takes
to download them. Remember, everything you
view from the web must first be downloaded
to your computer so we always want to take
that into consideration when using graphics
on the web.
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