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Smart Sharpen: Highlight/Shadow Radius "controls area in which PS looks"—isnt PS lokng at whole img?

Participant ,
May 11, 2024 May 11, 2024

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hi,

Im a bit confused to what "radius" in the highlight and shadow section of smart sharpen is doing. The highlight and shadow section is dampening or undoing the main section of smart sharpen, however the bit I struggle with is what some websites describe the function of radius in the shadow and highlight is.."Radius value controls the width of the area around each pixel that Photoshop looks at to determine if the pixel fits within the specified tonal range" — Isn't PS looking throughout the entire image to see which pixels are within the tonal range anyway? Can someone in simple terms explain this one to me or am I better off just to ignore the shadow and highlight section and just mask away/in areas for smart sharpen to affect? thanks

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Adobe
Community Expert ,
May 12, 2024 May 12, 2024

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Every sharpening action has a radius parameter. If there was no radius, there would be no sharpening.

 

This is one of those things that are easier to show than explain.

No sharpening - low radius - high radius:

sharpening2.png

 

 

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Participant ,
May 13, 2024 May 13, 2024

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thanks for the reply. I get the radius for the MAIN smart sharpen section sharpening bit (pixel width each side of edge), but I DONT get the radius for the "highlight" and "shadow" section of smart sharpen. To me it seems to be implying (from what tutorials have said) that it is the pixel width from a shadow or highlight edge that is searched by PS to see if it also qualifies as a shadow or highlight pixel (met by the "tonal width" setting). If I have summarised this correctly, then Im asking if PS could find the highlight and shadow edges in the first place why Is it searching within a certain radius/pixel width to see if other pixels meet the criteria of the tonal width (set in "highlights" and "shadows" section)

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