can anyone tell how can we hide datas permanently within bmp images

[Jessurider]

can anyone tell me how can we hide invisible data's permanently within bmp images

[peter_budo]

You need to search for Steganography, example here

[JamesCherrill]

That's called image steganography , so Google those terms.
Here's a good article to start with:
http://mo.co.za/open/stegoverview.pdf

[Ezzaral]

This was already answered in the OP's other thread for the same question but he chose to ignore the answers:
http://www.daniweb.com/software-development/java/threads/384210/1654757#post1654757