Adding and editing points on a curve

In this movie, I'l show you how to add and edit points inside Curves.…I'll start things off here by double-clicking…in the thumbnail for the curves one layer.…That brings up curves inside the Properties panel.…And I'm also going to drag this black triangle…back to the far left-hand side of the graph.…And that's because you can typically achieve more control over your shadows…in particular by adding points along the left-hand portion of the graph.…And I'll show you what I mean in just a moment.…But first,…I'm going to scroll the image over so that I can…better keep track of the woman in the foreground here.…And now I could just click at some point inside of…this shadow region here in order to set a point like so.…

And so in my case, I've set a point at Input 32 and Output 16.…So I'm taking any shades of gray that formerly had…a luminous level of 32 and I'm darkening them to 16.…And that's just by virtue of the natural curvature of the graph…so far. Alright.…Let's say I want to modify that point.…Well, I could drag it, of course, if I…