A section of the Lab color space.
<!DOCTYPE html>
<meta charset="utf-8">
<style>
</style>
<body>
<canvas id="painting" width=960 height=500>
<script src="https://d3js.org/d3.v4.0.0-alpha.45.js"></script>
<script src="https://d3js.org/d3-hsv.v0.0.js"></script>
<script src="https://d3js.org/d3-scale-chromatic.v0.3.js"></script>
<script>
var canvas = document.getElementById("painting");
var ctx = canvas.getContext("2d");
d3.range(0, canvas.width).forEach(function(x) {
d3.range(0, canvas.height).forEach(function(y) {
ctx.fillStyle = d3.lab(65, -100+200*x/canvas.width, -100+200*y/canvas.height);
ctx.fillRect(x, y, 1, 1);
});
});
</script>