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Unsharpmask causes white rings around dark areas, and black rings around bright areas. it's because USM just enhances contrast with same value on any luminosities.
but I think, on brights should be more enhanced contrast brighter, and on shadows should be more enhanced contrast more darker.
Therefore, I made an action of 2 passes USM2 with luminance masks (the way is as same as I showed before). The 1st pass has more amount+ and masking darks out, and 2nd pass has more amount- and masking brights out.
I applied it on the pool #1747. it had a heavily AM screening, so I filtered strongly.