Page 244 - DCAP303_MULTIMEDIA_SYSTEMS

Multimedia Systems

notes 3. Non-text files (like graphics) can also be encoded as ............. files for transmission.
( a) Monospaced (b) FixedSys
( c) ASCII (d) None of these

4. Non-proportional fonts, also known as bispaced fonts.
( a) True (b) False

5. The HTML files can be read by Web browser software like ....................
( a) Rich Text Format (b) ASCII
( c) Netscape Navigator (d) None of these

14.3 image

14.3.1 optimizing images for the Web

the Most Common Mistake
Once, we were asked to look at why a very simple Web page will have one small image and
about 400 words of text took over 1 minute to load. The answer was simple and is a mistake we
see over and over again.
The original image, which was large, was scaled to a small image size in a Website creation
program, not an image editing program.
When you resize your image on your Web page to the size of a postage stamp, you really have
not done anything to the image file size at all. What you are actually doing is telling the browser
to re-scale the image on the fly. This creates a lot of work for the browser. The image that you
thought is the size of a postage stamp is still that same large 8 x 10 inch image that takes over
2 minutes to download.
When you use an image editing program to resize the image, and you save it as a JPEG or GIF,
you have actually created a smaller image. Now that postage stamp size image that you saved
as a postage size JPEG will now load quickly on your visitor’s computer.
Gif and JpeG: two image formats you need to Know about
If you want to optimize your images the first thing you need to know about is the two image
formats recognized by your Web browser. These are GIF (pronounced jif as in Jiffy Peanut Butter)
and JPEG (pronounced Jay-Peg). Both are compressed. That means the information has been
organized inside the file in a special way in order to minimize the file size.
The difference between JPEG and GIF is the way that they compress the data. The JPEG
compression is designed to optimize photographs or images with fine gradations of colour. The
GIF compression is designed to optimize images with large continuous areas of colour, such as
illustrations. Some examples of these image formats are given below:

Low Quality Medium Quality High Quality
JPEG Image: JPEG Image: JPEG Image:
size 3KB size 6KB size 8KB

238 LoveLy professionaL University