I know you could shift double click in Lightroom and apply auto setting for that one slider. Except... I don't know how do you apply auto setting for that one slider for every picture. If you apply auto setting on blacks, and get 25, all pictures will have blacks on 25. But what I want is that all pictures' black is auto - which means they should also be different. Is there any way you could apply auto setting for one slider for every picture automatically?