Hi Florent
Sorry about mixing upthe two images...are you sure though? I could swear I commented on this image before?
but perhaps I am
The dark areas/patches are for sure a result of something in your processing, perhaps gradient removal..? They are deffinitely there looking at the images displayed at your web site, both the wide field and close-up colour versions.
I was only asking out of intereset as it is not that noticable and the image is still really good over-all
Mike