| Input type | Output type |
| float, float, float, float | color |
The rgba function constructs a (transparent) color from four floating-point values that specify the amount of red, green, and blue, and the opacity of the color. These values can range from 0 to 1. You can also use the rgba function to create color constants.
Examples:
rgba(1, 0, 0, 1) ; red rgba(1, 0.5, 0, 0.5) ; half-transparent orange rgba(0, 0, 0, 0) ; fully transparent black
See Also
rgb function
hsl function
Writing direct coloring
algorithms