red function

The red function extracts the red component of a color and returns it. Colors contain four components: red, green, blue, and alpha. To construct a color from the individual components, use the rgb or rgba functions.

Examples:

red(rgb(1, 0, 0))      ; 1.0
red(rgb(0.5, 1, 0.3))  ; 0.5
red(hsl(0, 1, 0.5))    ; 1.0

See Also
green function
blue function
hue function
alpha function
Writing direct coloring algorithms