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First I tried a smart object and Camera Raw adjustment tool mask which worked well but not any better than what's been described by Rich. Then I tried both the Color Range and the Black & White Adjustment layer techniques. ALL worked about the same for me, and the end result (on all) was a layer mask that just needed a tedious amount of Brush Tool refinement to isolate the blue colors of the original image.

I wont describe another technique as Rich's works as well as the other two I tried. All I added was lots of Brush Tool work on the layer mask.

I ended up with a very complex layer mask and a Hue & Sat adjustment layer set to "colorize" clipped to the original image layer.

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