I tend to like a (very) rough drawn mask with wide fuzzy edge so that I can 
match it easily to hill shapes etc rather than a  simple grad line.  This also 
lets you use your module of choice for the darkening rather than being 
constrained to the grad. Of these  the zone (or any sort of curve) module seems 
particularly appropriate as you can very flexibly control sky and cloud 
contrast without needing the separate parametric mask (although that too can 
indeed be useful).

Usually I find I want to do different colour or sharpening or denoise or shadow 
 ops on sky and background as well so having the drawn mask done and usable for 
any other selective ops is more than handy and I don't mind the few seconds it 
takes to create one.  A push button 'give me your best first  guess at drawing  
a land/sky mask' would be really nice :-)  Even if it was shockingly crude it 
would still be good enough in most cases with just a spin of the border width 
to make it usable I think - after all it only has to be better than a straight 
grad line to be better than the grad filter doesn't it?

-----Original Message-----
From: David Vincent-Jones [mailto:[email protected]]
Sent: 18 November 2014 20:25
To: [email protected]
Subject: [Darktable-users] Graduated density .. sky darkening

Something new (to me):
I find that using the graduated density module, with the control line set high 
on the image in conjunction with a parametric blend to exclude the light cloud 
values works well on color and particularly well on B/W.


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