Thanks! Basically I just want to change the intro, because what you wrote applies to all the tools in the local editing group, not just color correction.
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Go for it. If there other areas you’d like to be described (I know, don’t say “all of it”), I’m happy to add to it.
Looks like a picture got lost somewhere, or the path to it is wrong as i see only its link in wiki:
Adjustment layers apply an effect to the whole image unless the effect is constrained by one or more masks. (Layer mask)[mask-global.png]
Thanks, fixed!
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Hi!
Maybe I miss something. In preferences, color management, for monitor you can choose the Default color profile. For a reason, I don’t have all list available manually on GUI, and change ‘Directory containing color profiles’ does nothing. I have the same list. Example RTv4-xxx are missing, even if the directory is ‘output’
There are different kinds of ICC profiles. Are you sure that the profile you want is a screen profile?
Well, RawPedia says that RTvx-xxx are better versions that the ‘official’ ones like AdobeRGB. And I agree I tried on a very somber picture and RTV4 looks way better.
My screen is able to use Adobe1998 (it an Eizo CG277) at 99%.
So I assumed that using RTv4-medium (equivalent to Adobe1998) for displaying a picture (as I’ll save it with this profile when I’m done) is a good option. Am I wrong ?
What I don’t understand is why I can’t have the same list in preferences and in GUI, as I can choose RTv4-xxx manually any time during work.
In preferences you have a list of display profiles (either shipped with your display or generated by profiling).
In GUI you have a list of output profiles permitting to code the colors in output file and is embedded in image file.
I am not a specialist but I should say that you have better to choose an output profile with a gamut equal or greater to the gamut of your display.
In ART I am unable to keep both the horizon straight and the sun’s rays almost vertical
In Darktable it is easy to do with Keystone. Is this an idea for ART?
Try this (with -1.55 degrees rotation):
It’s a strange artifact that the reflection of an object on a surface even scattered is not perpendicular to horizon.
On ART it requires effectively some manual tweaking in perspective correction.
Thank you, Barry, It now works with these settings. This photo is not the best example, but a photo with a scaffolding (good Google translation?) In the foreground did not work (taken with a wide angle lens and with lens correction). is it a quest of trying to find the right settings?
I would call that a jetty (for accessing boats, fishing etc) 
Yes, it is trial and error really. Try using the auto-correct buttons, but be prepared to then adjust the settings to taste.
I just put the JPG in ART and it looks fine to me The jetty points where the jetty points. The edges which run more or less parallel to the horizon look natural. I’d be happy with that.
The horizon is straight, it’s the pesky curvy shoreline that makes it look wonky… I’ve got a lot of sunset shots looking across the ocean, and the perpendicularlity of the sun’s reflection on the water is invariant…
[quote=“ggbutcher, post:521, topic:16277”]
and the perpendicularlity of the sun’s reflection on the water is invariant…
[/quote] Ah! one thing on which we can agree! 
But still, the" deformation of image seems weird to me. There is a kind of shear vthat cannot be explained by perspective. What I could do in GIMP to get the man stand vertical and reflection of trees vertical
Yes, that’s the cause (I was already worried it was the lens) 
Therefore it is difficult to correct, but with the keystone module in DT it is very simple and fast. Hence my question whether this method is also an idea for ART?
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Good illustration. Thing is, I wonder if that is supposed to be corrected? Really, I have similar recent images (maybe I’ll dredge up a few for consideration) where i’ve considered the exact same thing. My new camera’s lens doesn’t help, as it is distorted by design and I haven’t yet put lens correction in my default processing toolchain, so I have to insert it by hand every time.
Where a shoreline goes is part of the scene, correcting it just doesn’t seem right, for some reason… 