image check poin we can use this in web testing to find the 
source and etc
bitmap checkpoint to use this we can find the images 
diffrence and speciffic screen area diffrences 
bye
 ravichandranath

Image checkpoints enable you to check the properties of a 
Web image.
You can check an area of a Web page or application as a 
bitmap. While creating a test or component, you specify the 
area you want to check byselecting an object. You can check 
an entire object or any area within an object. 
QuickTest captures the specified object as a bitmap, and 
inserts a checkpoint in the test or component. You can also 
choose to save only the selected area of the object with 
your test or component in order to save disk Space
For example, suppose you have a Web site that can display a 
map of a city the user specifies. The map has control keys 
for zooming. You can record the new map that is displayed 
after one click on the control key that zooms in the map. 
Using the bitmap checkpoint, you can check that the map 
zooms in correctly.
You can create bitmap checkpoints for all supported testing 
environments
(as long as the appropriate add-ins are loaded).
Note: The results of bitmap checkpoints may be affected by 
factors such as operating system, screen resolution, and 
color settings.