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<head>
<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>LUT image transform proof of concept</title>
<meta name="author" content="Peter Marquardt" />
<meta name="description" content="Proof of concept" />
<meta name="Copyright" content="Peter Marquardt" />
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="assets/css/reset.css" />
<link rel="stylesheet" href="assets/css/style.css" />
</head>
<body>
<div class="wrapper">
<img id="LUT"><canvas id="result" width="4096" height="4096"></canvas><br />
</div>
<script src="assets/js/libs/jquery-1.11.3.min.js"></script>
<script>
function initPage(){
var canvas = document.getElementById('result');
var context = canvas.getContext('2d');
var lutsegment = context.getImageData(0, 0, 256, 256);
var lutsegmentdata = lutsegment.data;
for (r = 0; r < 256; r += 1) {
for (g = 0; g < 256; g += 1) {
var lutx = r;
var luty = 256 - g - 1;
lutsegmentdata[(lutx + luty * 256)*4 ] = 255 * r / 255;
lutsegmentdata[(lutx + luty * 256)*4 + 1] = 255 * g / 255;
lutsegmentdata[(lutx + luty * 256)*4 + 2] = 0;
lutsegmentdata[(lutx + luty * 256)*4 + 3] = 255; // Alpha Channel
}
}
for (b = 0; b < 256; b += 1) {
for(i=0; i < lutsegmentdata.length; i += 4) {
lutsegmentdata[i+2] = b;
}
context.putImageData(lutsegment, (b*256)%4096, Math.floor(b/16)*256);
}
$('#LUT').attr('src', canvas.toDataURL());
$('img, canvas').wrap('<span class="imglabel"></span>');
$('.imglabel').each(function() {
$(this).append('<span>'+$(this).find('img, canvas').attr('id')+'</span>');
});
};
</script>
<script>$(document).ready(initPage);</script>
</body>
</html>