On some images I get a skin gloss after Unsharp Mask, even though I do a fade/luminosity channel blend mode.
Even when I go as low as 1,2 pixel and 85% amount.
I did no presharpening, and the gloss is the glow of the light on the skin, contracted to more visible dots through the sharpening process.
I wonder if in such images the gloss will disappear in RGB printing, or if it will stay, which, of course, can't be.
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First of all, what you see on the monitor is not necessarily what you will see in a print. I view my image at 100% when sharpening, and when the monitor shows very slight halos (that look like oversharpening) I know that when I print the image it will look fine. If I have doubts, I check the monitor at 50% or 25%, as some people say that that gives a better look at how the print will look.
Second, I seldom have the need for setting the Radius above 1.0, and with small detail in the image I usually do not go above 0.4 to 0.8. Depending on the image I have used anywhere from about 100 to 350 for the Amount.
When there is tiny detail that I don't want sharpened, I increase Threshold to 2-4 or 5, which will keep skin pores and other such detail from becoming prominent. However, when you increase the Threshold, you also have to increase the Radius and/or Amount to get the rest of your image sharp.
You might find that you get better reults using Smart Sharpen. Also, unless you are shooting RAW, your files may already be sharpened in the camera.
A quick but effective solution for portraits is to duplicate your original layer, and then sharpen the background layer so that the eyes and main details come out nice and sharp. Then, on the duplicate layer, use a Gaussian Blur. Blur will be low, say between 3 and 8 depending on your resolution. Then, use the Eraser on hair, eyes, teeth, jewelry, etc. to bring back the sharpness. Follow that by a reduction of opacity in the duplicate layer until you see the effect you like.