Personally, I would use a copy of a vertical strip for the left hand one. Then paste it into several new layers, Set these to 50% opacity then use the free transform to line up the horizontal lines. Once happy, set the opacity up to 100% again. Then create a brightness/contrast layer, and use the gradient tool, and possibly the spray can/brush to adjust the brightness to fit.
I think that the same should work for the right-hand edge, but, it will take smaller strips, due to the curvature of the boat.
An alternative way, would be to use a saturate/colours layer and carefully spray out using a layer mask, the offending colours.
There are probably better ways than these though. I had a quick go in gimp, the left hand side is definitely doable (I ain't very good at gimp, I find photoshop more intuitive).