Sorry but I disagree... I use the applied image method of sharpening, I "NEVER" use the High Pass filter, because of it's innate flaws. If you use the High Pass filter and match it with the same radius Low Pass filter (Gaussian Blur) and combine the two filters in a group. These two filters combined should have "0" effect, They should perfectly cancel each other out. As you turn the group on and off you will see that the High Pass filter is less than perfect...the shadow and highlight areas are distorted. If you do the exact same thing with the applied image method there is "NO CHANGE" when you turn off that group. I admit it is a bit more work but you can solve that with actions and build a number of them with different radius. Look up High Pass sucks for the step by step. Plus by using a clever radius in applied image you will also create a frequency separation and do sharpening at the same time by how you mask things.... Plus your method doesn't create a black and white mask that you can combine with other black and white masks.
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