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<!DOCTYPE html>
<html lang="en">
<head>
<title>Perceptual Color Nudging</title>
<meta name="viewport" content="width=device-width,initial-scale=1">
<style>
html {
background-color: #0c0c0c;
color: #cccccc;
font-family: "Cascadia Code", "Cascadia Mono", monospace;
}
body {
display: flex;
margin: 0;
white-space: nowrap;
min-height: 100vh;
}
body>div {
display: flex;
flex-direction: column;
align-items: center;
padding: 2rem;
}
form,
h2 {
margin: 1rem;
}
p,
pre {
margin: 0.5rem;
}
table {
border-collapse: collapse;
}
table td {
padding: 0.5rem;
}
</style>
</head>
<body>
<div style="flex: 2; align-items: flex-start; background-color: #0c0c0c">
<form>
<input id="background-color" name="background-color" type="color" value="#0c0c0c" />
<label for="background-color">background color</label>
</form>
<table>
<tr>
<td>Input</td>
<td>WCAG21:<br>APCA:</td>
<td id="stats-input"></td>
</tr>
<tr>
<td>ΔE2000<br>(ConEmu)</td>
<td>WCAG21:<br>APCA:</td>
<td id="stats-cielab"></td>
</tr>
<tr>
<td>ΔEOK</td>
<td>WCAG21:<br>APCA:</td>
<td id="stats-oklab"></td>
</tr>
</table>
</div>
<div id="input" style="flex: 1">
<h2>Input</h2>
<pre style="font-size: 8pt">猫</pre>
<pre style="font-size: 10pt">猫</pre>
<pre style="font-size: 12pt">猫</pre>
<pre style="font-size: 14pt">猫</pre>
<pre style="font-size: 16pt">猫</pre>
<pre style="font-size: 32pt">猫</pre>
<pre style="font-size: 64pt">猫</pre>
</div>
<div id="cielab" style="flex: 1">
<h2>ΔE2000 (ConEmu)</h2>
<pre style="font-size: 8pt">猫</pre>
<pre style="font-size: 10pt">猫</pre>
<pre style="font-size: 12pt">猫</pre>
<pre style="font-size: 14pt">猫</pre>
<pre style="font-size: 16pt">猫</pre>
<pre style="font-size: 32pt">猫</pre>
<pre style="font-size: 64pt">猫</pre>
</div>
<div id="oklab" style="flex: 1">
<h2>ΔEOK</h2>
<pre style="font-size: 8pt">猫</pre>
<pre style="font-size: 10pt">猫</pre>
<pre style="font-size: 12pt">猫</pre>
<pre style="font-size: 14pt">猫</pre>
<pre style="font-size: 16pt">猫</pre>
<pre style="font-size: 32pt">猫</pre>
<pre style="font-size: 64pt">猫</pre>
</div>
<script type="module">
import Color from "https://cdn.jsdelivr.net/npm/colorjs.io@0.4.3/+esm";
window.Color = Color;
const input = document.getElementById("input");
const cielab = document.getElementById("cielab");
const oklab = document.getElementById("oklab");
const statsInput = document.getElementById("stats-input");
const statsCielab = document.getElementById("stats-cielab");
const statsOklab = document.getElementById("stats-oklab");
let backgroundColor = new Color("#0c0c0c");
let foregroundColor = new Color("#0c0c0c");
let foregroundColorRange = null;
let previousSecsIntegral = -1;
function saturate(val) {
return val < 0 ? 0 : val > 1 ? 1 : val;
}
function clipToSrgb(color) {
return color.to("srgb").toGamut({ method: "clip" });
}
function nudgeCielab(backgroundColor, foregroundColor) {
const backgroundCielab = backgroundColor.to("lab-d65");
const foregroundCielab = foregroundColor.to("lab-d65");
const de1 = Color.deltaE(foregroundColor, backgroundCielab, "2000");
if (de1 >= 12.0) {
return foregroundColor;
}
for (let i = 0; i <= 1; i++) {
const step = (i == 0) ? 5.0 : -5.0;
foregroundCielab.l += step;
while (((i == 0) && foregroundCielab.l <= 100) || (i == 1 && foregroundCielab.l >= 0)) {
const de2 = Color.deltaE(foregroundCielab, backgroundCielab, "2000");
if (de2 >= 20.0) {
return clipToSrgb(foregroundCielab);
}
foregroundCielab.l += step;
}
}
}
function nudgeOklab(backgroundColor, foregroundColor) {
const backgroundOklab = backgroundColor.to("oklab");
const foregroundOklab = foregroundColor.to("oklab");
const deltaSquared = {
l: (backgroundOklab.l - foregroundOklab.l) ** 2,
a: (backgroundOklab.a - foregroundOklab.a) ** 2,
b: (backgroundOklab.b - foregroundOklab.b) ** 2,
};
const distance = deltaSquared.l + deltaSquared.a + deltaSquared.b;
if (distance >= 0.25) {
return foregroundColor;
}
let deltaL = Math.sqrt(0.25 - deltaSquared.a - deltaSquared.b);
if (foregroundOklab.l < backgroundOklab.l)
{
deltaL = -deltaL;
}
foregroundOklab.l = backgroundOklab.l + deltaL;
if (foregroundOklab.l < 0 || foregroundOklab.l > 1)
{
foregroundOklab.l = backgroundOklab.l - deltaL;
}
return clipToSrgb(foregroundOklab);
}
function contrastStringLevels(num, level0, level1) {
const str = num.toFixed(1);
if (num < level0) {
return `<span style="color:crimson">${str}</span>`;
}
if (num < level1) {
return `<span style="color:coral">${str}</span>`;
}
return str;
}
function contrastString(foregroundColor) {
const contrastWCAG21 = contrastStringLevels(foregroundColor.contrast(backgroundColor, "WCAG21"), 3, 4.5);
const contrastAPCA = contrastStringLevels(Math.abs(foregroundColor.contrast(backgroundColor, "APCA")), 45, 60);
return `${contrastWCAG21}<br/>${contrastAPCA}`;
}
function animate(time) {
const timeScale = time / 1000;
const secsIntegral = Math.trunc(timeScale);
const secsFractional = timeScale % 1;
if (previousSecsIntegral != secsIntegral) {
const foregroundColorTarget = new Color("srgb", backgroundColor.coords.map(c => saturate(c + Math.random() - 0.5)));
foregroundColorRange = foregroundColor.range(foregroundColorTarget, { space: "srgb" });
previousSecsIntegral = secsIntegral;
}
foregroundColor = foregroundColorRange(secsFractional);
input.style.color = foregroundColor.toString({ inGamut: false });
const foregroundCielabNudged = nudgeCielab(backgroundColor, foregroundColor);
const foregroundOklabNudged = nudgeOklab(backgroundColor, foregroundColor);
cielab.style.color = foregroundCielabNudged;
oklab.style.color = foregroundOklabNudged;
statsInput.innerHTML = contrastString(foregroundColor);
statsCielab.innerHTML = contrastString(foregroundCielabNudged);
statsOklab.innerHTML = contrastString(foregroundOklabNudged);
requestAnimationFrame(animate);
}
requestAnimationFrame(animate);
document.getElementById("background-color").addEventListener("input", event => {
backgroundColor = new Color(event.target.value);
document.documentElement.style.backgroundColor = backgroundColor;
}, false);
document.documentElement.style.backgroundColor = backgroundColor;
</script>
</body>
</html>