@siva4444 Considering the size of your images, which are less than most javascript scripts inserted a webpage, I don't think it matters too much.
If you're feeling frisky there are probably some open source alternatives (image optimisation/compression etc) out there you could have a stab out but overall I wouldn't let this keep you up at night. If your images were a factor of 10 bigger then you might need some serious offerings but otherwise I'm not sure it's worth it.
I could be wrong though :). Hope I helped in some way.