lum function
| Input type | Output type |
| color | float |
The lum function calculates the luminance of a color and returns it. The luminance ranges from 0 to 1. To construct a color from hue, saturation, and luminance values, use the hsl or hsla functions.
Examples:
lum(rgb(1, 0, 0)) ; 0.5 lum(rgb(0.5, 0.4, 0.3)) ; 0.4 lum(hsl(1.5, 1, 0.5)) ; 0.5
See Also
red function
hue function
sat function
alpha function
Writing direct coloring algorithms