This would be one idea - quick and dirty without a lot of optimization. The principle: use contrast-brightness-saturation with a drawn and parametric mask; additionally activate the dithering module if you expect banding.

Ulrich

Am 18.03.2014 04:29, schrieb Kevin:
I have a photo where there is a section of the sky on the horizon that is very
white / bright. My question is: Is it possible to selectively darken that
patch of sky without leaving any banding or other artifacts?

The image, low quality jpg to save bandwidth, is at
https://dl.dropboxusercontent.com/u/9190000/IMG_2974.jpg

(Colours may be total cr@p as I'm on the road and only have my laptop.)

Thanks in advance,
Kevin

Attachment: IMG_2974.jpg.xmp
Description: application/wine-extension-xmp

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