How do you "AND" together two masks please?

[sls141 (St.Stephen)]

Maybe this will help. Good luck!

Lightening a area

I have a photo with a section of the background in a shadow. I would like to lighten it as I want the focus of the photo on the boy in it, and I think the dark area distracts from accomplishing that. I would like help on the best way to select it and to lighten the coloring. I have tried using parametric selection in dt, but that has left a thin line on the right side of the shadow unselected. I have also tried Free Select in GIMP, but haven’t been able to make a smooth transition from the dark…