How does the noise reduction parameters work?

[iso9001]

As a new and increasingly very happy user of PDN, I realize the power of PDN. It's a pleasure that there is such great and simple windows SW out (here) for free. However, the major problem with all free software, is the lack of documentation. I have the following question, that I have not yet found an answer for.

How does the noise reduction parameters work?

(The parameters in the pop-up window are called Radius and Strength and appears in: Effects -> Noise -> Reduce Noise menu.) I.e How do they work technically? How do I use them?

There was something in the thread:

http://paintdotnet.forumer.com/viewtopic.php?f=12&t=25188&p=191701&hilit=noise+reduction#p191701

But the question was never answered!

Grateful for any explanation.

[Genius]

Good question!

It's a kind of blur with the difference that the color of output pixel is not related with neighbor pixel color's.

[Ego Eram Reputo]

The two parameters are Radius and Strength. I'm guessing, but I'd feel confident that the radius is the area sampled to find defects, and the strength is the harshness of the defect. If you think of the Noise Reduction as a blur you get the idea.

This is an old thread where a noise cancelling algorithm was discussed: viewtopic.php?f=16&t=21160&start=0

GREYCstoration is an open-source noise canceling algorithm

You might find some tips no how Noise Reduction works by searching for that.

[Rick Brewster]

Noise Reduction is not based on GREYcstoration at all. It's something that Tom Jackson came up with; I'm trying to get him to comment on this thread, but we're all on holidays so it's not a priority.