Hi again everyone,
I think I finally got it!Even though not 100% sure if this is exactly the technic Jim was talking about - probably because Paintshop is a little different compared to Gimp2 - I followed the following procedure:
I used the free selection tool aka "lasso" with a Feathered edges of 30,0 to draw a loose shape all along my coastline extending quite far out into the sea.Then I used the Blend Tool with an offset of 30,0 to fill the outlined area with a black to white color gradient.
However,and even though the resulted .bmp was nearly perfectly blended, there was a slightly visible line where the black to white blending stops and the pure white outside my free selected boundary blended area start to appear.In my efforts to somehow soften the already almost invisible edges close to shore, I gave it a try by using the "Smudge" tool just to scramble the edge a bit in order to appear more "physically" shaped as in real nature there aren't straight lines.
Thing is I'm in a different computer right now and my FSX is based at my other rig so I'm unable to test my work in FSX environment at the moment.However I'm almost certain it will look like a charm.
In the photos below you see the actual image taken with Google Earth,the primarily waterblended image and also the "smudged" final image.What do you think?Will actually do the work correctly?
Any input/proposal is greatly appreciated!
Cheers,
Nick.