Is there a way to programmatically darken the colo

Question

Let's say I have the RGB values like this (in R, for example):

cols <- c("#CDE4F3","#E7F3D3","#F7F0C7","#EFCFE5","#D0D1E7")

Is there any way to programmatically derive another set of colors which is a darkened version of the former?

It doesn't have to be R.

Answer 1

Yes there is.

You will have to specify how darken or lighter you what to go.

Here is a Function done in JavaScript: https://css-tricks.com/snippets/javascript/lighten-darken-color/

function LightenDarkenColor(col, amt) {
    var usePound = false;
    if (col[0] == "#") {
        col = col.slice(1);
        usePound = true;
    }
    var num = parseInt(col,16);
    var r = (num >> 16) + amt;
    if (r > 255) {
      r = 255;
    }else if  (r < 0){ 
      r = 0;
    }
    var b = ((num >> 8) & 0x00FF) + amt;
    if (b > 255) {
      b = 255;
    }else if  (b < 0) {
      b = 0;
    }
    var g = (num & 0x0000FF) + amt;
    if (g > 255) {
      g = 255;
    }else if (g < 0) {
      g = 0;
    }
    return (usePound?"#":"") + (g | (b << 8) | (r << 16)).toString(16);
}

Hope it helps, Cheers.