Fiddle with NIK software
Nik was recently bought by Google and their software price was substantially reduced. They used to have 2 versions, one was used as a plug-in for Photoshop and the other was a standalone. The plug-in was more expensive and could process images as PS objects. I use mine frequently because it's an easy way to get some powerful results. Effects can be painted on part of your image so you can reduce noise in some parts and retain fine detail in another. I use Tone Contrast quite a bit to punch up clouds and hazy mountains, etc. You can reduce any effect by adjusting the opacity of the change layer in PS, or add a layer mask to suit.
|Leaving the office, Central London. by Edward48|
from Your City - Night Shift
|Running free by LassiM|
from My Best Photo of the Week
|Everyone's happy at Disney World! by Pixney|
from Disney World