To add to the subject line… Not just to remove residual color, but also to remove lingering background color in quasi-transparent areas (like the frizzy hair in my example image below, or wedding veils or etched windows for architectural pics, etc.).
I have been running some sample image tests using MAI 1.0.2 plugin to Ps CC 2019 (Win PC).
1st I drew a manual TriMap on my image. Started with the CUT (all red) view.
Then ran the Compute in AI Mode to produce my initial mask that I tweaked (using Contrast Mode in Mask & in the Edge Tab). Two views of the tweaked mask are here:
From there I Accepted the mask back to my Ps CC layer (which I’d added a white mask to prior to starting work in Mask AI). I used the Overlay Brush (in black and in white) on that mask and applied some Levels adjustments on the mask):
Finally, I used that mask to alter the Exposure of the background to have the woman stand out. When I did so it became obvious there was still a fair amount of the light blue residual color from the Original image still in her hair. I’d like a way to remove that in Mask AI prior to returning to a Ps Layer: