Luminosity Mask Question

[IanBarber]

I know how to make Luminosity Masks for Lights1, Lights2, darks1, Darks2 etc...

What I am trying to figure out is how to make a selection of the image say with the Lasso Tool and then find out which Luminosity mask suits that selection by selecting each one in turn.

[Semaphoric]

You could use the Eydropper tool, and set the second readout in the Info panel to Grayscale with a large sample size, like 31x31.