Local Sharpening in Lightroom

[Manoli]

'Jeff posted in PhotoPxl in response to this thread ...'
Indeed he did, and has posted a follow up clarification:

' ... the local adjustment increases or decreases the settings in the same units that the global settings occur (with the exception noted herein) So, if you had a setting of 40 in the global and you used a setting of +20, that would be the same as having the setting be 60 in those areas. Similarly, if you used a -20, the resulting settings in the global +40 would be 20. '

[Slobodan Blagojevic]

What seems likely is that, even when you zero the global slider first, moving the local slider actually moves the global slider too, just the display remains at zero?

Isn't it what I said in the reply #4, after all?

[fdisilvestro]

I'm not sure I follow, if the global slider were to move, then the whole image would be affected. When you move the local slider, only the area affected by the brush/mask is changed.

[jrsforums]

I'm not sure I follow, if the global slider were to move, then the whole image would be affected. When you move the local slider, only the area affected by the brush/mask is changed.

I does seem that the action of the local sharpening (except for -51 to -100) is totally dependent on the global sharpening settings.  Said differently, local sharpening effectively increases or decreases the amount setting of global sharpening for the selected area, but cannot reduce amount below ‘0’.

[fdisilvestro]

I does seem that the action of the local sharpening (except for -51 to -100) is totally dependent on the global sharpening settings.  Said differently, local sharpening effectively increases or decreases the amount setting of global sharpening for the selected area, but cannot reduce amount below ‘0’.

Yes, but it does not "move" the global slider.

[jrsforums]

Yes, but it does not "move" the global slider.

…because the globalsetting is not changing.  It is still being applied to the entire (global) image.  The local slider only modifies the amount to the selected area.

[Manoli]

Yes, but it does not "move" the global slider.

No, it doesn't but to does move it 'under the hood'.
To better understand the workings , set the global settings to maximum

Amount 150
Radius 3
Detail 100
(Masking 60) - that's to refer to a secondary point later, not essential for this example.

Draw your radial Mask ( not a mask but a 'selection, in reality)
Then play with the Sharpness slider - what do you see ?

The selected area is being 'increased/decreased' ... even past the maximum 150 (try switching the visibility of the mask on/off with Global:150 and you'll see the effect)

So, if you had a setting of 40 in the global and you used a setting of +20, that would be the same as having the setting be 60 in those areas

...those areas being the area selected by your 'mask'.

[fdisilvestro]

moving the local slider actually moves the global slider too, just the display remains at zero?

I was referring to this statement

What you see in the local adjustment area is the combined effect of the global and local slider, but the global slider does not move

[Manoli]

I think I understand what Slobodan meant but it wasn't a treatise.
ITM, I believe Andrew Rodney best summed it up succinctly and accurately in post #6.

Local sharpening can add or reduces more or less of the sharpening as set in the global Detail panel if it's on. And if its off.