Masking Bird Wings - Can't Remove White Highlights

[flashpixx]

Operating System

1. Windows 10

The attached photo shows a Whistling Kite which I have edited in LRC 14.0.1.
Noise reduction/sharpening has been applied using DXO pro Pure Noise.
The resulting image is a DNG
I have added a subject mask to the bird and an inverted subject mask for the sky.
When the subject mask is applied to the bird it also includes the sky between the feathers at the end of each wing as part of the subject.
I remove this part of the subject mask by subtracting using a brush.
When I apply exposure adjustment to the subject (increase exposure) white edges appear right at the base of the "finger feathers" at the end of the wings.
No amount of subtracting (or adding to the inverted mask) will remove these.
I note if I leave the overlay highlighted (in red), the white highlights are shown as solid red.
The image was shot using a Nikon D500 and a Nikkor AFS 300 f4 PF.
There is no Purple fringing evident.
As can be seen in the photo there are obvious white edges to the ends of the wing feathers.
Is there a way to edit the image to better apply an exposure adjustment to the subject in situations like this one?
Many thanks

 

[Johan Elzenga]

Lightroom always feathers masks a little. The brush does this even when the feathering is set to zero. Zoom in a lot, subtract the white areas and allow for a little overlap in the tip of the wings. As these tips are very dark anyway, this should be much less noticeable than white between the tips.

 

[Philippe Coudé du Foresto]

You could also try to use select object instead of select subject. I found that very often object gives a much better masking than subject.

 

[flashpixx]

You could also try to use select object instead of select subject. I found that very often object gives a much better masking than subject.

Thank you Philippe this does seem to work better