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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Opacity Flattening for Large Images</title>
<style>
div {
display: inline-block;
height: 40px;
width: 40px;
opacity: 0.25;
}
.png40x40 {
background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACgAAAAoAQMAAAC2MCouAAAAA1BMVEUAAACnej3aAAAADElEQVQI12NgGFkAAADwAAHXt5aiAAAAAElFTkSuQmCC) no-repeat;
}
.png40x4096 {
background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACgAABAAAQMAAAA6ETG7AAAACXBIWXMAAC4jAAAuIwF4pT92AAAAB3RJTUUH5QceCDgMmIF9RQAAAANQTFRFAAAAp3o92gAAAC5JREFUGBntwTEBAAAAwiD7p14IX2AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAMAtYAAAAfQusroAAAAASUVORK5CYII=) no-repeat;
}
.png40x4097 {
background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACgAABABAQMAAADxTeIeAAAACXBIWXMAAC4jAAAuIwF4pT92AAAAB3RJTUUH5QceCDgchTZtIQAAAANQTFRFAAAAp3o92gAAAC5JREFUGBntwTEBAAAAwiD7p14JT2AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAMBJYAYAAYO1lz8AAAAASUVORK5CYII=) no-repeat;
}
.png4096x40 {
background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAEAAAAAAoAQMAAABETK3BAAAAA1BMVEUAAACnej3aAAAAK0lEQVR42u3BMQEAAADCoPVPbQ0PoAAAAAAAAAAAAAAAAAAAAAAAAACAFwNQKAAB/x49MAAAAABJRU5ErkJggg==) no-repeat;
}
.png4097x40 {
background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAEAEAAAAoAQMAAACrjsb/AAAAA1BMVEUAAACnej3aAAAAK0lEQVR42u3BAQ0AAADCoPdPbQ43oAAAAAAAAAAAAAAAAAAAAAAAAACANwNQUAABp9gL6AAAAABJRU5ErkJggg==) no-repeat;
}
</style>
</head>
<body>
<div class="png40x40"></div>
<div class="png40x4096"></div>
<div class="png40x4097"></div>
<div class="png4096x40"></div>
<div class="png4097x40"></div>
</body>
</html>
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