On the fly clientside image to webp converter...but png's are not transparent
So here first of all i wanna share a very nice way to convert your images
to webp.
1.Open with Chrome
2.Set The quality
3.Drop an image inside the page
4.Wait (depends on the size .. try small images first)
5.Hover the image to see the size difference
6.To properly save it as webp just click on it
The compression is fantastic.But i have a small problem... png's are not
transparent..
what could it be? maybe set the canvas to transparent? how?
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<style>
html,body{
width:100%;
height:100%;
margin:0;
padding:0;
display:-webkit-flex;
display: flex;
}
a{margin: auto;}
.imG{
max-width:800px;
max-height:400px;
}
form{
position:fixed;
bottom:0px;left:0px;
}
</style>
<script>
(function(W){
W.URL=W.URL||W.webkitURL;
var D;
function init(){
D=W.document;
D.body.addEventListener('dragstart',pdrop,false);
D.body.addEventListener('dragenter',pdrop,false)
D.body.addEventListener('dragover',pdrop,false);
D.body.addEventListener('dragleave',pdrop,false);
D.body.addEventListener('dragend',pdrop,false);
D.body.addEventListener('drop',drop,false);
}
function readablizeBytes(bytes) {
var
s=['bytes','kB','MB','GB','TB','PB'],m=Math,e=m.floor(m.log(bytes)/m.log(1024));
return (bytes/Math.pow(1024,e)).toFixed(2)+" "+s[e];
}
function pdrop(e){
e.stopPropagation();
e.preventDefault();
}
function drop(e){
e.stopPropagation();
e.preventDefault();
console.log(e.dataTransfer.files[0]);
var f=e.dataTransfer.files[0];
var i=document.createElement('img');
i.onload=function(e){
window.URL.revokeObjectURL(this.src);
var b=document.createElement('canvas');
b.width=this.width;b.height=this.height;
var c=b.getContext("2d");
c.drawImage(this,0,0);
this.onload=function(){
this.className='imG';
var d=document.createElement('a');
g=f.name.split('.');g.pop();
d.download=g.join('')+'.webp';
d.href=this.src;
d.title=readablizeBytes(atob(this.src.split(',')[1]).length)+' vs
'+readablizeBytes(f.size);
d.appendChild(this);
D.body.appendChild(d);
}
this.src=b.toDataURL('image/webp',D.getElementsByName('o')[0].innerText*0.01);
};
i.src=window.URL.createObjectURL(f);
}
W.addEventListener('load',init,false);
})(window)
</script>
<title>Image To Google's webp format</title>
</head>
<body>
<form onsubmit="return false" oninput="o.value=v.valueAsNumber">
<label for="q">Choose the quality and then drop a image</label>
<input name="v" id="q" type="range" min="0" max="100" value="0">
<output for="q" name="o">0</output>/100
</form>
</body>
</html>
ps.:for best results use jpg's and reload the page every time as it just
appends every new image
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