In essence we are heading towards layer~channel territory here - but this might be an intermediate step…
Being able to lock-in the settings of a local adjustment from the effects of global correction(s) or other local corrections.
e.g. You have the foreground subject (local) lit as You wish - but now want to darken the background (global) without affecting the foreground… or the background is a local correction that You wish to blur and have the foreground local adjustment stay sharp.
Please “Like” this post if You are out of votes (or have votes You do not wish to commit) - but think the above request is a useful feature.
Hello Jim,
Just one question - isn’t it the task for the inverted mask?
Regards,
Svetlana G.
Hi Svetlana!
The inverted mask could do this if there was just one local adjustment. But suppose You had several local corrections, each one needing its own correction not based on any of the others.
At its core this is a time saver type of feature where changing the global correction can leave the local adjustments unaffected - so one does not have to go back and re-adjust all the local corrections to what they were originally intended to be.
One nightmare scenario would be lots of French windows where all the little panes~squares (many of which might be a local adjustment) in every window would have to be recorrected again to compensate for a changed global adjustment.
My own personal nightmare - this house (please see Fig.1 below) was full of these French windows & doors - for which many panes had to be individually corrected. In the image below we are looking from the kitchen towards the living room.
Now imagine the client wants the room “a bit lighter” - under the current regime many of the little panes (each one a local adjustment) in every window (and all other windows) would have to be recorrected again to compensate for the changed global adjustment. 
Fig. 1 This spherical projection was used for QuickTime VR, reduced 85% from the original:
Hi Svetlana,
A quick question. When you say inverted mask are you referring to a future requested feature? I am not aware of any such feature currently in PL. If there is one how do you access it?
Mark
Thanks. The way Svetlana phrased her post it almost sounded like it already existed and I was starting to doubt myself not being aware of such a potentially useful feature .
Mark
Hello 
,
Sorry for misleading you, I just wanted to say that there is no need to request inverted mask anymore as it’s already in the backlog.
Now got it . Thanks. I like the idea 
Regards,
Svetlana G.
I understand your requirement for this example.
PhotoLab is designed to carry out the maximum Global Corrections before applied LC.
It is normal (and good) that modifying the GC drives the LC.
I understand this. But I also like to have options for different needs - i.e. this type of set-up does not allow for granular control of a complex lighting environment - either in-camera or synthesized later.
An example - done with Photoshop (years ago) - but illustrates the point regarding isolating masks in order to control~create complex light. Obviously adding the black dress & wings is not in PhotoLab’s purview - but the lighting effects would be.
This image would have been incredibly time consuming to create with out individual (“isolating”) masks.
Original shot: Under dull grey skies - perfect for manipulating the light in post…
Synthesized Light: 17 unique masks + background
Control of the interaction of the various lighting elements should not be limited by the software.
Guys,
Any suggestion has the right to exist and we’ll estimate the necessity based on your votes and likes 
Regards,
Svetlana G.
