Glossary

GB- Gigabyte

KB- Kilobyte

MB- Megabyte

TB- Terabyte

Hex Codes

Red------------#FF0000
Green----------#00FF00
Blue------------#0000FF
Grey------------#CCCCCC
White ----------#FFFFFF
Yellow-----------#FFFF00
Magenta--------#FF00FF
Aqua or cyan---#00FFFF

Caracteristics of bmp, gif, jpeg, png & xcf

File----Stands-----web--------supports --------Number----compression
Type---for----compatiobale--web animation--of colours------------

bmp---Bitmap--------Yes-----------No-------------Millions-------No

--------Graphic
gif-----Interchange---Yes----------Yes-----------256 max-------Yes
--------Format

--------Joint
jpeg---Photgraphics--Yes----------No-----------Millions --------Yes
--------experts group-------------------------------2 24

--------Portable
png----network------Yes------------?--------------Vary----------Yes
--------graphics

-------Experimental
xcf---computing----No------------No-------------Millions-------No
-------facility

Transparent backgrounds

How can you check weather an image has an alpha (transparency) channel or not?

One of the main ways that you can check if an image has a transparent backround is through the program "Gimp."

• Use an erraser to rub out the image

If the image you erase leaves a white trail behind it, it is not transparent. However if you come across a checkard board effect, than it has a transperant background.

• Select colour picker and click on image

With this you can see all the (RGBA) values

To add an alpha channel

Rightclick/layer/transperancy and Add Alpha Channel

Thumbnails

What is a thumnail? Why is it good to display large images on a web page using a thumbnail link?

A thumbnail is a smaller version of a large image, especailly made to suit web pages. It is a good idea to display large images with a thumnail link because that way the viewer is able to see the thumnail. That then helps them decide whether they are prepared to put up with the wait that viewing the large version requires.

Why is image size an important issue in web site development?

Image size is an important issue in web site development because, depending on the size of the imagine thats how long it will take to load. If the image is really big, then it will take longer to load then one that is compressed or small.

Difference in file sizes: BMP,GIF & JPG

File name--------File size KB ------------Load time in secs (FS/6)
stars.bmp--------260 Kb-----------------44.33 seconds
Star.gif-----------6 KB--------------------1 second
Star.jpg----------20 KB------------------3.3 seconds

Loading time for Images on the Internet

File Name ----------------File size KB: ---Load time in secs (FS/6):

Blackheart-demon.gif: -6 KB -------------1 Second

50cent2.jpg:-------------23 KB ------------3.8 Seconds

magick.png :-------------12 KB ------------2.1 Seconds

stars.bmp:--------------- 260 KB ----------43.3 Seconds

Internet Image standard

New Width---1 inch---2 inch---3 inch-----2.5 inch
Pixels px------72--------144------216--------180