Color Luma

Menu Path : Operator > Color > Color Luma

This Color Luma Operator outputs the luma (perceived brightness) of the input color.

Left: A ring with segments of different colors. Right: The same ring using shades of gray that represent the perceived brightness of each color.

The luma value of a color is useful in many scenarios, for example:

You can use it to recolor particles and still maintain their original brightness.
You can utilize it in the simulation itself and make the brightest particles move faster.

Note: Color Operators work on a per-particle level. To recolor the particle's texture on a per-pixel level, use Color Mapping in the system's output Context or create your own shader via Shader Graph.

Operator properties

Inputs	Type	Description
Color	Color	The Color to calculate the luma for.

Output	Type	Description
luma	Color	The luma value of Color.