Great - and welcome to PL 9.4 !
Could you please post a practical example instead of the theoretical discussion? That would help me better understand what you hope to achieve with “intersect”.
Yes, I had tried to follow your writing (post #18), just that it doesn’t make sense to me.
- The duplicated and inverted AI mask (Sky) – as long it works – selects everything else than the sky.
- Then you exclude that very part from the selection with Invert shape.
- By adding a graduated filter you simply fill the gaps that are present after applying “Invert Shape”. That is, the graduated filter extends the selection within the common Mask (and also covers the sky, but you don’t see it).
. Now, if you deactivate the duplicated submask you will see no change.
. But if you deactivate the initial AI mask (sky), the duplicated mask has no function – as if you never applied those AI masks (Sky) – and the graduated filter becomes also visible in the sky. – So what’s the point of the exercise?
Please note, I’m not defending DxO’s current solution, but like to understand YOUR problem.
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You may like to check out "Invert Shape" - bug or user error? and get some ideas with a bunch of “solutions” on different images.