In the older versions of LR one could create a brush and then restrict it by either the Luminance Range or Colour Range. I found this extremely useful, however I am struggling to understand how the new masking features work.
From what I can work out the auto mask function, when using a brush, works by selecting based upon colour. That's fine.
But I can't work out how to create a brush that responds to and only to the luminance range. I can set a luminance range, narrow or widen it and then add a brush, but every time I do that and make a change with the brush the entire image appears to be affected. Previously I could create a brush, restrict the brush to a luminance range and then paint over an area so that only the areas with similar luminance to where the cross hair was positioned are affected. I just can't seem to do that with the new version.
Am I being stupid or missing something? Any thoughts?
Thanks