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Select the layer with the mask you want to adjust
Go to the Channels panel and turn on the mask view icon .
Then hit the ~ key to turn off the RGB channels
You will see the mask as greyscale on screen
Now Image Adjustments -Curves and increase the contrast by adjusting the curve
When you are done, double click on the RGB channel in the channels panel to restore the normal view
Could you please post a screenshot with the pertinent Panels (Layers, Channels, Options Bar, …) visible?
1 person found this helpful
Whilst I gave you the method to adjust the overall contrast in post 1 above, there is another method if you just want to increase contrast in parts of a mask - leaving other parts untouched.
Set at brush to 50% opacity and the brush blending mode to overlay. Click on the mask and brush with black where you want to darken the darker greys and with white where you want to lighten the lighter greys. This is very effective at sharpening up a mask edge.
Hope that helps you further