Curves (avfilter)
Description
This effect/filter adjusts shadows, midtones and highlights of an image using curves. It is similar to the Color Levels or Levels effects but with the option to create additional points along the curve allowing for pinpoint accuracy when adjusting brightness values.
Tabs
Tab |
Description |
|---|---|
All |
The curve applies to all color channels equally |
R |
The curve applies to the red channel only |
G |
The curve applies to the green channel only |
B |
The curve applies to the blue channel only |
Parameters
Parameter |
Description |
|---|---|
In |
The X coordinate of the selected point. Defines the luma input value. Use this input field for very fine adjustments of the curve. |
Out |
The Y coordinate of the selected point. Defines the luma output value. Use this input field for very fine adjustments of the curve. |
Reset curve |
Resets the curve in the selected tab to a straight line |
You can adjust the curve by dragging any point of the curve. This will create a new handle (indicated by a red dot) that can be adjusted any time later.
Existing points can be deleted with RMB 
Example
Curves (avfilter) with all channels adjusted differently
Hint
It is recommended to use this effect while in Color layout as this comes with RGB Parade and Scope - Histogram already switched on. If you want to use the effect while in Editing or Effects layout, turn on the Histogram widget with .
Hint
Use the split-screen function of the effect panel to compare the effect with the original. You can enable it with 
. See Effect/Composition Stack Functions.
See also
Curves (frei0r) does the same thing but only allows one channel to be adjusted.
See also
The Bezier Curves effect does the same but has the ability to adjust the steepness/flatness of the curves.