This function returns the amount of red used to make the given colour, with the value being between 0 and 255, where 0 is no red and 255 is all red. The following image illustrates this:
|col||The colour to check|
r_comp = colour_get_red(c_teal);
The above code will get the red component of the colour constant "c_teal" and store the value in the variable "r_comp".