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Another tip I've seen, based on that, is to use the Graduated Filter instead of the brush. Drag a very narrow Graduated Filter and position it slightly outside the image edge so that the entire image falls under the part of the mask that is 100% opaque. Then erase the part you don't want.Lightroom does not have that option. However, what you can do is first brush the entire image with the biggest brush possible (turn off 'auto mask'), and then switch to the eraser to brush away what you don't want. That is effectively painting an inverted mask.
Lightroom does not have that option. However, what you can do is first brush the entire image with the biggest brush possible (turn off 'auto mask'), and then switch to the eraser to brush away what you don't want. That is effectively painting an inverted mask.