set curve points

[Geppetto Luis]

select points with the curves

set black point

set white point

set gray point

as shown below

[Davide_Barranca]

You mean, based on the coordinates of the black, gray and white point?

Not sure it can be done "automatically": the ScriptListener records just the final points set by the Curve, the eyedropper tools seem to be something the Curves dialog manages itself.

[Geppetto Luis]

David how I could do it.

[Davide_Barranca]

This may help getting started: adjustCurves() help

[Geppetto Luis]

I need to make an automatic reading.

[Jarda Bereza]

You can read document histogram. Gray scale or certain channel histogram. Or you can utilize color samplers on certain pixel positions. And then you can calculate your curve.