I added in “Color and Light” the function “Color correction grid” which allows a color shift.
Of course you can only act on a color selected with “scope”. You can modulate the intensity with “strength”
and original
jacques
2 Likes
@Daniel_Catalina
What exactly you want ?
“Milky way” is a very special image.
You can use (for me the best) “wavelet” and especially “Residual image”
Of course you can use also “locallab”, in addition with 2 settings
a) for the sky with "Retinex - Dehaze (strength 25 - chroma 9, Radius 160, Contrast 80, Dehaze 55, Scope 50)
b) for the bottom of the image : exposure
jacques
1 Like
Thank you for the suggestions.
What I would like to do is selectively enhance color and contrast in the portion of the sky where the milky way is.
I will try the modules you suggest.
@Daniel_Catalina
The problem is what is the problem ?
I don’t know, what is a good image for milky way.
I know (I read forum for this thematic), the best tool is “wavelet” - with separation in levels for contrast and residual image. In this sense Rawtherapee has, I think of one of the most advanced tools in the field of wavelets
On other way, “Retinex + Dehaze” allow to increase contrast…and reduce the sensation of mist.
I think others tools, as “local contrast” must be used.
Of course you can also use, Color and Light and exposure with mask…
etc.
jacques
1 Like
RawTherapee_newlocallab_5.5-658-g613784af9_WinVista_64_190219.zip
From:
https://keybase.pub/gaaned92/RTW64NightlyBuilds/
Is running fine here.
The new tools work really well, keeps getting better, thanks for all the hard work.
One thing that I have noticed is that the exposure tool in locallab behaves very differently. In the main tab, I can recover highlights from the sky very well, whilst trying to do it in locallab, it doesn’t work so well.
Here is a rough and ready example:
Original with sky over exposed:
Some sky details recovered using main exposure tab:
Trying to do the same with locallab, results in grey areas, but no details:
Any suggestions, is there a better way I can do this? Thanks!
GWR railway 43.RW2 (14.8 MB)
GWR railway 42.RW2.pp3 (19.3 KB)
@spidermonkey
First, thanks for testing !
it is obvious that there are differences of behavior
-
main exposure is at the begining of process
-
locallab is near the end
-
main exposure is in rgb mode
-
locallab exposure is in Lab* mode
I don’t say it is impossible to hav the same behaviour, but difficult
Nevertheless, I propose a pp3 which deals with the highlights but differently
I commit a change, with
- replace “int” by “double” for “deltaE weakening” “Exposure expcomp”, “Sharpening Radius and Blur radius”
- to harmonize with main menu, and also more accurate
You must clear cache (or delete cache)
jacques
1 Like
Thanks for the pp3 Jacques, I look forward to trying it out. I guess the best strategy is to try and adjust highlights with other tools which have more image information to play with, then lighten areas of the image using locallab.
@spidermonkey,
I use Local Lab’s Tone curve to take care of that.
Included is a pp3. I hope it helps.
@jdc,
Salut Jacques, thanks for your hard work and the fun time. I wish you the best with this wonderful project. Merci 
I will be away from RT’s Local Lab.
there are other ways to get there, for example
GWR railway 42.RW2jdc3.pp3 (19.2 KB)
The first spot, to reduce the exposure of the sky, is an exclude spot, on the half upper image
The second spot, to increase the exposure of the passenger and railways is a normal spot
1 Like
We can improve the result, with 2 others spot, to to lighten the shadows in the trees
GWR railway 42.RW2jdc4.pp3 (26.7 KB)
To compare with original
I just added “shadows Highlight” (only in Lab mode). This allows a good improvement in the case above
I just commit today (March 4th)
- 2 GUI changes : 1:1 to some expanders and Display hue chroma luma ref to mask curves (thanks to Pandagrapher
- add slider to improve mask with “GuideFilter”
Jacques
2 Likes
Used last version of locallab with good results in a short time, i’m very happy with it.
I hope to see localab in official release of RT.
839 crashes when I try to export a picture.
W10 Pro
Last few versions work well for me, no crashes for months.
RawTherapee_newlocallab_5.5-847
https://keybase.pub/gaaned92/RTW64NightlyBuilds/
Is running fine here.
Did also try “Spot removal tool” 5.5-256 -----
But it crashed when I tried to open an image.
Unfortunately, RawTherapee_newlocallab_5.5-847 crashes quite often.
Here is an image and pp3 that always crashes on opening - opens momentarily, then RawTherapee shuts down.
Running on Windows 10
GWR railway 42.RW2 (14.8 MB)
GWR railway 42.RW2.pp3 (23.3 KB)
(Yes that picture again, I have taken others too!)
Tried clearing the cache, still a problem
@spidermonkey
Effectivly it crash… whenever, I desabled all “rubrics” as “exposure”…
The 3d spot generate a crash,even in this case it’s empty…no action…
If I delete, and add a 3d spot, no crash…curious…
jacques