How to compare images selenium, using java

Hi All,
Can anyone please explain me how to compare 2 jpeg images in selenium, using java.

Selenium RC does not have any specific commands to validate the two image, but you can validate them using css selector

Can you please give me an example of using css selector for comparing images.

you can compare two images with their Properties something like color of image and width and height... So can you tell me that what kind of images you wanted to compare. I can help you If you can elaborate your question

I have 2 jpeg images , i need to check whether those two images are same or not in the runtime. This is the scenario

Okey, We can't check them as like bit map check point but you can check their properties... something like...
css=img[backgrouundcolor="Block"][height="300"]...

Hi, Iam following this blog to compare images http://binodjava.blogspot.com/2009/05/how-to-use-runtimegetruntimeexec-how-to.html..but couldn't run dos commands

given url is not accessible by me. it giving "Page not found "

Please find the below.

http://binodjava.blogspot.com/2009/05/how-to-use-runtimegetruntimeexec-how-to.html