Then here I recommend a good software for reducing noise:
http://www.neatimage.com/
It does a better job than build-in plug-ins in photoshop.
But as I said before,unfortunately it's not completely free,but the demo version don't have time limit and can save pics in jpeg(fixed compression level @ 91/100),enough for general use I think.
Feature map here:
http://www.neatimage.com/featuremap.html