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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Reference: Opacity Flattening for Large Images</title>
<style>
div {
display: inline-block;
height: 40px;
width: 40px;
opacity: 0.25;
}
.blackcolor {
background: black;
}
</style>
</head>
<body>
<div class="blackcolor"></div>
<div class="blackcolor"></div>
<div class="blackcolor"></div>
<div class="blackcolor"></div>
<div class="blackcolor"></div>
</body>
</html>