Lab Color Sharpening
This sharpening technique is probably the most popular technique with professional photographers because it helps to avoid the color halos that appear when you add a lot of sharpening to a photo. And because it helps to avoid those halos, it allows you to apply more sharpening than you normally could get away with.
Open the photo you want to sharpen using Lab sharpening.
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Go to the Channels palette and you can see that your RGB photo is made up of three channels—a ...