I just commit a change
I have found why, the mask does not work…a simple forgetfulness on my part !
Now mask works (I hope)
If blend is at 0, the system works, it take into account the mask to improve shape detection, without other change on the image
if blend < 0 (substract) or blend > 0 (add), you mixed the “mask” (the difference) with the original, but before workind on it with locallab.
Of course transition works.
I hope no error, and no problem with memory (of course this functionnality use a lot of memory!!)