Do you have Photoshop? There you have all sorts of smoothing things. "smear", soften, "gaussian ..." etc etc. It's a little difficult for me to point exactly to the right menu items, i am using german versions of most of my programs. I mostly wanted to prepare the terrain for people maybe can help you more than i can. Let's see what MightyPete for example has to say - if he is around these days.

One day your ship comes in - but you're at the airport.