Constructing d3.rgb(r, g, b) using d3.svg.arc() to compare darker, normal and brighter variations
Sources:
xxxxxxxxxx<meta charset="utf-8"><style> body { font-family: Consolas, monaco, monospace; padding: 20px; background: #eee}</style><body><header> <p>rgb darker, rgb normal & rgb brighter</p></header><section id="vis"></section><script src="//d3js.org/d3.v3.min.js" charset="utf-8"></script><!-- d3 code --><script src="script-compiled.js" charset="utf-8"></script> https://d3js.org/d3.v3.min.js