Very sharp LSF settings

[gelo333]

Tell me what LSF values to set to get a very sharp image. I can't do this even at high settings. I mean any variant of LSF, LSFmod, LSFPlus, etc. I will install any of them.

[jagabo]

LSFMod(strength=10000)

[gelo333]

haha! No. You only get distortion at the edges, but the textures aren't sharp at all.

[lollo]

I can't do this even at high settings

Maybe because LSF stands for Limited Sharpen (Faster).

You can go with oversharpening using high settings, but as the author (Didée) explain here this filter has been designed to do not oversharp https://forum.doom9.org/showthread.php?p=559985#post559985:
Shortly, LimitedSharpen() applies one out of three different sharpeners (two domain sharpeners or a windowed range sharpener) to the source, but will limit the oversharpening (either "hard" or "soft") IF it exceeds a defined "overshoot".

[gelo333]

I also thought that LSF itself limits sharpness. Should this be considered the final decision?

[jagabo]

haha! No. You only get distortion at the edges

Of course you do. Those are over-sharpening halos. But you asked for very sharp settings.

but the textures aren't sharp at all.

Of course they're not. LSFMod (and other variants) are edge sharpeners. The don't sharpen textures (unless the textures are so high contrast they look like edges).

[gelo333]

Can we conclude that the sharpeners that work separately with edges and separately with textures are only Finesharp and DetailSharpen? Or, after a general increase in sharpness, soften the edges with some kind of filter.

[jagabo]

You can use Overlay() with a mask to avoid sharpening edges:

edges = mt_edge(mode="prewitt", thy1=20, thy2=20).mt_expand().Blur(1.0)
Overlay(Sharpen(1.0), last, mask=edges)