Manipulating Images

I need help reading and manipulating each row and column of a jpeg image. I have a jpeg images, and I have to blank its odd row. Thanks in advance.

You can download a library to load JPEG from http://www.ijg.org/.

You can also find an example here:
http://www.smalleranimals.com/jpegfile.htm

Thanks Members,

I shall check the library. It looks good. I shall get back if I face some problem...Thanks once again.