Web site Designing - ADOBE
PHOTOSHOP
Graphics and graphic design play
an important part in building a web site. Graphics
provide with a way to establish a visual hierarchy
in information. A user viewing a web page will
initially see it as a mass of shapes and colors.
This is where well-designed graphics supported
by good page layout can grab viewer attention.
Graphics are
defined in terms of “pixels”
or picture elements. Each pixel has a small
amount of memory allocated to it for its color
information. An image in which only one bit
is allocated to a pixel can have only two color’s,
since the bit can be either 0 or 1.
When 8 bits of memory are allocated to each
pixel, the pixel can have one of upto 256 colours.
This forms the
basis for a lot of Web graphics. The GIF,
used extensively on the web, is an eight bit
graphic format, where the image can have a maximum
of 256 unique colours. Eight bits per pixel,
which means a Photograph measuring 640x480 pixels
a standard monitor resolution, would be 640x480
bytes in size which makes 307,200 bytes, or
over 300k. Of course, GIF files use internal
compression techniques to reduce the size in
bytes, but the fact is - more colours=bigger
file size.
Creating small
graphics files is key to distributing images
on the World Wide Web, with smaller files, Web
savers can store and transmit images more efficiently,
and viewers can download images more quickly.
To decrease file size by saving artwork in one
of several compressed file formats. Formats
used on Web - Graphics
Interchange Format{GIF} and Joint Photographic
Experts Group{JPEG}
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