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2 years ago
<!doctype html>
<html>
<meta charset="utf-8">
<head>
<title>3DLUT Base Cube Maker</title>
<style>
canvas {
min-width: 512px;
min-height: 64px;
image-rendering: pixelated;
}
#cube {
max-width: calc(100% - 20px);
overflow: auto;
}
</style>
</head>
<body>
<h1>Color Cube Image Maker</h1>
<div>size:<input id="size" type="number" value="8" min="2" max="64"/></div>
<p><button type="button">Save...</button></p>
<div id="cube"><canvas></canvas></div>
<div>( note: actual image size is
<span id="width"></span>x<span id="height"></span> )</div>
</p>
</body>
<script type="module">
const ctx = document.querySelector('canvas').getContext('2d');
function drawColorCubeImage(ctx, size) {
const canvas = ctx.canvas;
canvas.width = size * size;
canvas.height = size;
for (let zz = 0; zz < size; ++zz) {
for (let yy = 0; yy < size; ++yy) {
for (let xx = 0; xx < size; ++xx) {
const r = Math.floor(xx / (size - 1) * 255);
const g = Math.floor(yy / (size - 1) * 255);
const b = Math.floor(zz / (size - 1) * 255);
ctx.fillStyle = `rgb(${r},${g},${b})`;
ctx.fillRect(zz * size + xx, yy, 1, 1);
}
}
}
document.querySelector('#width').textContent = canvas.width;
document.querySelector('#height').textContent = canvas.height;
}
drawColorCubeImage(ctx, 8);
function handleSizeChange(event) {
const elem = event.target;
elem.style.background = '';
try {
const size = parseInt(elem.value);
if (size >= 2 && size <= 64) {
drawColorCubeImage(ctx, size);
}
} catch (e) {
elem.style.background = 'red';
}
}
const sizeElem = document.querySelector('#size');
sizeElem.addEventListener('change', handleSizeChange, true);
const saveData = (function() {
const a = document.createElement('a');
document.body.appendChild(a);
a.style.display = 'none';
return function saveData(blob, fileName) {
const url = window.URL.createObjectURL(blob);
a.href = url;
a.download = fileName;
a.click();
};
}());
document.querySelector('button').addEventListener('click', () => {
ctx.canvas.toBlob((blob) => {
saveData(blob, `identity-lut-s${ctx.canvas.height}.png`);
});
});
</script>
</html>