Beautiful Ken and quite a pleasant and a much needed variation on the 'long exposure' genre of photography we often see
Don't know if you are a PS user, but if you are, then what I sometimes do to selectively reduce the noise in such images and especially in the sky area where the noise can often be at its greatest, yet at the same time keep as much detail as I possible can within the edges of the image, is to duplicate the background layer twice (Ctrl+J twice), then on the top layer use the [filter], [noise] and [despeckle] menu option and perhaps even use it more than once depending how noisy the image actually is. Then hide that layer, then in the second layer down, go to [filter], [other] and [High Pass] and set the slider until you can clearly see all the edges within the image. Then press Ctrl+U to desaturate that high pass layer and then go into levels with Ctrl+L and using the sliders (aggressively) move them around until you end up with what looks like a completely black and white line drawing and which we are now going to invert with Ctrl+shift+I and then use as a mask. Then select and copy all of this black and white layer with Ctrl+A, then Ctrl+C and then delete the layer. Now go to the despeckled layer and create a new white mask, then hold down Alt and click on the mask and then type Ctrl+V, then Alt click the mask again and so you should now have a mask that protects the sharpness of all the edges in your image, but at the same time allows all the noise reducing effect of the despeckle filter to work on the none edged parts of the image. If you then zoom into to 100%, you will probably find that you also have to blur this mask slightly to remove any obvious delineation lines between the light and dark areas of the mask, but with a little practice and some tweaking, you can usually achieve quite a good and well targetted noise reducing effect within the image and without any great loss to the sharpness detail to all of your edges.
Of course you could try other Noise reducing filters, but I find they tend to soften all of the image a little too much for my liking - but anyway, you probably don't use PS very much or at all and so this will probably not be something that is of use to you
Dave
