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Frequency Separation Sharpening... (FSS)
Sep 7, 2020 00:59:56   #
Rongnongno Loc: FL
 
FSS was mentioned in this thread

As usual I became curious so I went for it...

First a youtube search. I found a couple of videos, all slightly different.

I had to try it and see by myself.

I selected a throw away image that I had not deleted for some reason and played with it.

Since I was going to use filters I selected to open as smart object (just in case)

Duplicate the layer twice
Rename the lower copy 'Blur' (how original)
Select Gaussian filter with a low radius (1.0~3.0 - Changed it to 2.0 Note that i could just have not used it!!!)
Rename the upper copy 'Sharpen' (hey i crave for originality)
Use Image>Apply (You will need to rasterize the layer.)
In the popup menu set
- Source (default)
- Layer (Blur)
- Blending (subtract)
- Scale and offset are usually set by PS CC and are fine. If not use 2/128
- Press ok
Set the layer mode to 'Linear light'
Create a curve adjustment layer
Set the mid point (127 or 128)
Clip to the layer below (down arrow)
Visually adjust the dark side.
Adjusting the light side is also possible but this quickly will create a fringe

Since I am a bit of a creep i created two more clipped curve layers adjusted individually.
The result was that I created a dark fringe
Still being creepy I grouped all the layers into a group named FSS and adjusted the opacity.


-

Original
Original...
(Download)

FSS
FSS...
(Download)

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Sep 7, 2020 07:58:16   #
ecobin Loc: Paoli, PA
 
It's also called High Pass sharpening and many postprocessing programs include it as an adjustment layer. I use it all the time.

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Sep 7, 2020 08:48:31   #
abc1234 Loc: Elk Grove Village, Illinois
 
I agree with ecobin about high pass sharpening but tend to prefer the shake reduction filter in Photoshop. Takes more time but the result can be as sharp yet more natural looking.

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Sep 7, 2020 10:08:59   #
Rongnongno Loc: FL
 
ecobin wrote:
It's also called High Pass sharpening and many postprocessing programs include it as an adjustment layer. I use it all the time.

This is not a conventional high pass sharpening.

Notice the filter high pass is not used. The effect is similar and confusing because of it.

(This uses Image>Apply on layer vs a high pass filter)

Note:
- Highpass is a filter that can be used in a smart object and edited as needed.
-- Apply does not have this advantage.
- Highpass addresses only RGB as a whole
-- Apply addresses RGB, R, G, or B so in that aspect more flexible.
- Highpass depends on itself
-- Apply source selection is any open document.
-- Apply layer selection can be any existing layer within the source document

Personally I do not see how this flexibility can help beside the RGB, R, G or B selection. Even then I am not sure if using layer style would not allow for the same narrow channel selection when using a highpass filter.

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Sep 8, 2020 08:51:27   #
kymarto Loc: Portland OR and Milan Italy
 
I just use Sharpen AI and/or Piccure+. Both use deconvolution that is head and shoulders so far superior to other methods that I have completely stopped looking at alternatives.

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