10.4.17 - Curves

Curves allows you to create an arbitrary re-mapping of brightness values. Just choose the number of points you want to work with, then drag the points in the curve to where you want them, observing the effect in the Preview window as you work.

Tip: When you change the number of points on the curve, the new curve will be a re-interpolated version of the previous one, insofar as that is practical. What I mean by that is that if you have a complex curve controlled by 20 points, and you change it to a three point curve... well, it's going to be less complex, isn't it?

Save allows you to save a curve you've created in a JSON file.

Load allows you to load a curve you've saved in a JSON file.

Reset sets the curve to a linear state.

The curves operator

This was done with Monochrome (luma),
Gaussian Blur (7 pixels), and
Curves (as shown below) with the eyes cut out, in that order.

Curve used for metallic look on Monochrome