ColorWheel Node
The ColorWheel node can be used to generate disc patterns. By default it generates a preview of all the colors in the visible spectrum
Usage
The pattern can be changed in size and color.
The ColorWheel can be used to test the result of a color grading. Below we can easily see the settings of an HSVTool darkening the reds.
The ColorWheel can be desaturated to turn it into a circular geometric pattern.