Neat Image to minimize the noise in the 'shadows' ...
I used curves eye drop method..... used the white eye drop for the whitest part of the swim suite, black sample from her hair.
grey sample was done this way.....
creat a new layer, fill it with 50% grey.
make sure this is the top layer (over the image in question)
change the blending mode from normal to difference.
now make an adjustment layer, choosing threshold.
when the threshold box open, move the right slider all the way to the left, untill everything is white.
slowly move the slider right until the first indication of black appears.
with the eye dropper tool, hold down the shift button and click in one of those first black pixels.
once this is done, press cancel to the threshold layer, and then delete the new layer (the one filled with grey)
now open up the curves dialog box, select the middle eye dropper (for greys)
with the middles eye dropper, click inside of the sample you took when you shift clicked one of the black pixels as descriped above.
once this is done, select the eye dropper tool and select the color sample eye dropper tools out of the options.
a "clear" buttons appears near near the top at the left.
hope this helps your needs
After you duplicate your layer and set it on screen, merge your 2 layers, duplicate again, set the mode on "color", run Median (Filter, Noise) and try different values (I tried 12 on your picture and it worked nicely).
This won't remove all the stray pixels though, just the weird colors that show after.
Hope this helps a bit,
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