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