What gaussian/sigma values are implem.for "sharpen" func?

[pstein]

When I load a JPG picture into PSP and click on the "sharpen" icon in the toolbar this picture is sharpened.

As far as I understand the "sharpen" function is implemented by a kind of gaussian/sigma filter.
I guess these filter values are hard coded into PSP.
What are these values?

In detail I would like to know the values for

- "radius" : The radius of the Gaussian, in pixels, not counting the center pixel
- "sigma" : The standard deviation of the Gaussian, in pixels
- "gain" : The fraction of the difference between the original and the blur image that is added back into the original
- "threshold" : The threshold, as a fraction of QuantumRange, needed to apply the difference amount

Thank you
Pstein

[LeviFiction]

Couldn't tell you. You'd have to try asking Corel directly and they probably won't answer. But it never hurts to try.

It's even possible that the sharpening method is of an older type that doesn't make use of any of those values.

[Jean-Luc]

Not exactly the same subject but about sharpening too :
https://hexus.net/tech/news/graphics/13 ... rt-coming/