Which filter corresponds to the Tone Curve module in GIMP?

Software GIMP
1

I’m looking for the GIMP or Gegl filter that corresponds to the Tone Curve of GIMP. The “gegl:contrast-curve” filter seems similar to the Tone Curve, but it only adjusts grayscale images, whereas the Tone Curve is applicable to color images or each color channel.

There is also a “gimp:curves” filter, but there is no information about it. Which filter corresponds to the Tone Curve module in GIMP?

2

I am not sure if I am missing something here, but why not just use the curves option in GIMP. Why does it have to be a ‘filter’?

3

Because I try to use it from Python script. Gimp.Drawable.curve_spline() can apply tone curve to the image, but it changes pixel values destructively. I am looking for the way to apply tone curve non-destructively from Python script.

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