Image check point - It will capture your whole image.
Bitmap Check point- Using this you can capture desired area
of image or other portion.

Image checkpoint : by using image check point we can use 
path of the image and source it's using only for webtest 
bitmap check point : by using this we can check versions 
vairations, and particular image before and after.
if any thing wrong then pls tell me...........

Ravi u r correct..

here Image check point uses to check the properties of an 
Image(Like source, size, positions etc..)..it supports only 
for Web.

Bitmap checkpoint uses to check the check versions 
vairations, and particular image before and after.

Regards
Nanda
nanda.dreddy@gmail.com