Curve

Last update: Thu Feb 26 2026 00:00:00 GMT+0000 (Coordinated Universal Time)

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Remaps the values in an image using a custom curve.

The node provides an interface to image tonality remapping, similar to other 2D image editing applications. The user can place points and adjust Bezier curves to remap the input, which can be either grayscale or color.It is especially useful when used with gradient transitions to remap them to a specific height profile, it allows for very precise modeling of bevel profiles and the like.

Unlike most other nodes, the Curve node does not have a typical standard interface with sliders and parameters, but instead presents a full fledged curve editor. See the below expandable section on how to use it.

This does however mean that none of the parameters from a Curve node can be exposed to a subgraph. The only option here is to use a Multi-Switch to switch between different curve profiles.

Parameters

Curve editor

Input connectors

Output connectors

Examples

Parameters

Apply/Expose curve Boolean

Allows to copy the user curve to the output instead of applying it to the input image

Curve addressing Boolean

This parameter determines how HDR pixels out of the [0, 1] range in the input are handled: clamped or fold up to [0, 1].

Curve Array of curve keys

The custom curve used to map the input grayscale values. May be edited using the Curve editor.

Curve editor

Create and move a point

In order to create a point, simply double-click anywhere on the Curve view:

Controlling the point influence

In order to obtain precise results, the curve nodes offers different modes for each point:

Reset the point mode to the default value.

Lock/Unlock the 2 bezier handlers so the user can move them together or independently.

Both side of the point are controlled by a Bezier handler.

The right side of the point is controlled by a Bezier handler while the left side remains flat.

The left side of the point is controlled by a Bezier handler while the right side remains flat.

The point sides remain flat

Show input histogram

You can show/hide the histogram of your input just by clicking on

Controlling each channel individually (color input)

When you input is a color node, you have the ability to ajust the curve for each channel:

Just select the curve you want to ajust in the dropdown list located on the top right:

While in RGB curve mode, you canhide/show the individual channel curves by pressing/unpressing :

Aligning, mirroring and flipping

If you right click on the curve view, you will get some more options.

Align top: Align the selected points horizontally with the highest one.

Align middle: Align the selected points horizontally to the selection’s average height.

Align bottom: Align the selected points horizontally with the lowest one.

Distribute horizontally/vertically: Distribute the points on the selected axis

Flip horizontally/vertically: Flip the selected points according to the selected axis.

Mirror horizontally/vertically: Mirror the whole curve, according to the selected axis

Keyboard Shortcuts

LMB + Drag

Draw a selection box.

Shift + Drag

Constrain the movement on the X or Y axis.

Alt + LMB + Drag

Temporarily break the handles to move them independently.

Adjust the framing of the curve

While tweaking the handlers, you may be in a case where one handler is going over the curve view.

In that case, you can use the button to fit the size to the content.

The button resets the zoom level to 1

Input connectors

Input Grayscale/Color PRIMARY

The image to be processed.

Output connectors

Output Grayscale/Color

Examples

Coming soon.

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