Is Noise Reduction working properly?

[HerrDerToene]

I've tried to erase noise of some photos and noticed a strange behavior. I did the following:

 

1. Open a Photo

2. Use Filter -> Noise -> Noise Reduction (I'm using the German version, hope it's called that way)

3. Set Luminance Noise to Extrem, and take the slider to a high setting. Everything else is set to default.

 

What I got before rendering, just seeing the preview in the main window is what you can see in Preview.png.

 

What I got after rendering you can see in Render.png.

 

Render looks much worse to me. Is this meant to be or might this be a bug?

 

Thanks for your help.

Herr der Töne

[My Strawberry Monkey]

It is worse, try bringing down the details slider and bringing up the contribution slider, just tried and got a better result.

 

 

Allan