Local Lab build

(Desmis) #641

I understand what you mean.

You can find documentation in Rawpedia (in french)

But basically you have to unlearn, work with mask and “lasso”.
If you know Capture NXD, or DxO, local controls are close (with less possibilities) in principle to those I put in place in RT.

if you want to have something that looks (a bit) like what you know - I do not recommend it at all with RT-spots - you have to set the scope values to 100.


(Desmis) #642

I just push a commit with some improvments (GUI, exclude)

I recommand to clear cache


(JegMeg) #643

I tried to compare RT 5.5-621 vs DxO PL
RT seems to give some weird result.

First I tried to set global exposure to about the same in both progs.
Then I did local adjustment with both.
All I did was adjusting local exposure


GWR railway.RT1.jpg.out.pp3 (15.3 KB)

Increasing exposure

GWR railway.RT2.jpg.out.pp3 (15.3 KB)

I downloaded the RAW file from this thread #586


Edit. Global exposure was not the same on both prog , but it should not matter so much.

(Desmis) #644

In fact there are important differences between DxO settings and RT settings whithout “local”
Look at each images…tree, sky, very different

Second point, since begginning I am not satisfied with “Exposure compensation” (the one I used in “Local” is different from “Global” but use the same principle. It really tends to overexpose too much (in local or in global)… on my list of jobs to do, there is this

But, facing this problem where parts of the image are very under-exposed, I have found an other manner

GWR railway 42.RW2jdc.pp3 (15.5 KB)

(dngimage) #645

@gaaned92 and @jdc,




Is running fine here.

(Alberto) #646

Adjust scope to max value and the filter will apply without any color or shape detection, then adjust transition to change the border.

(dngimage) #647

@gaaned92 and @jdc,




Is running fine here.

(Desmis) #648

Hello all
Thanks for testing !

I made various adjustments-modifications since my last message

Now exposure works better, and take into account “chroma”. Previous versions adjusted the exposure in lab mode by changing only the luminance
I add a slider “Chroma compensation” set to 30 by default

I think, that I will not make any changes - unless of course users request, or bug


(Vitor Novaes) #649

I tried and that didn’t work well. For the kind of thing that I do the tool as it is now is useless for me :frowning_face:
I believe I’ll have to get Capture One for that.

A normal dodge and burn kind of mask (and layers?) Is not possible to do in RawTherapee, or that is just a matter of choice in developing the tool? If it is the second case, I think its really a mistake.

I mean, I don’t want a software to try to judge for itself the area to apply a setting, this just don’t make sense for me as a photographer. If i want to bring up the exposure on just one side of a face because the lighting didn’t had the right contrast ratio, I simply can’t. I didn’t know there were other programs that worked that way, and I believe they shouldn’t.

Capture One has the best features in this regard of any photo editing program, as it have booth masks, with some kind of qualifier and layers.

A Node based workflow could be wonderful also, but I think that would really be impossible to implement hehe

(Desmis) #650

I’m not trying to challenge your point of view.

Did you see that there are masks in “Color and Light” and “Exposure” ?

Have you tried with multiple spot ?

Have you tried with the “Spot Method” : “Excluding spot” ?

Did you consult the documentation (in french) http://rawpedia.rawtherapee.com/Local_Lab_controls/fr


(dngimage) #651

@gaaned92 and @jdc,




Is running fine here.

(dngimage) #652

@gaaned92 and @jdc,




Is running fine here.

(Daniel Catalina) #653

@jdc Any hints on how one will use local adjustments to enhance the milky way in a night photo as here [PlayRaw] Milky Way over Geroldsee ?

(Desmis) #654

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


(Desmis) #655

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


(Daniel Catalina) #656

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.

(Desmis) #657

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…


(dngimage) #658

@gaaned92 and @jdc,




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)

A tone equalizer in darktable ?
(Desmis) #660

First, thanks for testing !

it is obvious that there are differences of behavior

  1. main exposure is at the begining of process

  2. locallab is near the end

  3. main exposure is in rgb mode

  4. 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

GWR railway 43.RW2jdc.pp3 (19.3 KB)