Hi,

Am Sa 24 Jan 2015 14:21:37 CET
schrieb Patrick Shanahan <p...@opensuse.org>:

> To my "non"-discerning and very untrained eye, I only notice a
> slightly brighter (lighter) tone in the lightest portion of the sky.
> The only way I see "blotchy" is if I expand the view too much???  And
> you have masked the "noise" very effectively in both shots.
> 
> cravat:  My eyes are elderly and due for cataract surgery.
> 
> But I do like the scene. 

Thanks! 

I am comparing 100% view: 500px complained some days ago that
a shot of mine was too noisy for their sales program. They say they 
want a clean image in 100% view. Now I am wondering how to give them
that. Personally, I don't mind a bit of luminance noise.

If you look at the large smoking chimneys, near that illuminated
tower, you can see a kind of graininess/blotchiness in the clouds in
100% view. It's not there before denoising -- then the image is simply
noisy, but the clouds are more uniformly cloudy. 

To me it looks like the non-local means filter uses a local
means for the lightness of an area, and the borders of the filtered
areas are showing as blotches. Or something like that.

May be I am being fussy, but a little perfectionism doesn't hurt :-)

Michael

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