I think with all these different filters it's a question of optimizing for each different image - I've found in the past that the 2x 'rule' sometimes makes edges too sharp, so I just usually set the amount at 100% , threshold at 3 or 4 and then adjust the radius until it looks about right - sometimes takes more, sometimes less.
It is strange (but probably just me) - I tend to work on covers in the 600DPI domain while labels i'll often resize to 300DPI and then do the work.
Whatever works as long as the results are good is okay with me!
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