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index.html
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<!DOCTYPE html>
<html>
<head>
<title>transparent</title>
<meta name='viewport' content='width=device-width, initial-scale=1, user-scalable=no, maximum-scale=1, minimum-scale=1'/>
<meta name="description" content="remove background color">
<link rel="canonical" href="https://kosamari.github.io/transparent" />
<style type="text/css">
@import url(https://fonts.googleapis.com/css?family=Copse);
* {
background-color: #CECECE;
font-family: Copse, Rockwell, Georgia, serif;
}
#input {
width: 0px;
height: 0px;
opacity: 0;
overflow: hidden;
position: absolute;
z-index: -1;
}
#input + label {
width:99%;
min-width: 250px;
font-size: 1em;
padding:5px;
color: #f3f3f3;
background-color: #777;
display: inline-block;
box-shadow: 1px 1px #555;
text-align: center;
}
#input:focus + label,
#input + label:hover {
background-color: #999;
}
#input:focus + label {
outline: 1px dotted #000;
outline: -webkit-focus-ring-color auto 5px;
}
#drop-target{
margin-top: 5px;
width: 100%;
min-width: 250px;
height: 50px;
border: dashed 2px gray;
line-height: 50px;
text-align: center;
color: #777;
}
#message{
margin: 10px 0px;
}
h1 {
text-shadow: 3px 3px 2px white;
}
button {
font-size: 1em;
padding:6px;
color: white;
background-color: #55ACEE;
box-shadow: 1px 1px #555;
border: none;
margin: 5px 0px;
width:100%;
}
button:hover {
background-color: #66BDEE;
}
#container {
max-width:500px;
min-width: 250px;
margin-left: auto;
margin-right:auto;
}
a {
text-decoration: none;
color: #00144B;
}
</style>
</head>
<body>
<div id="container">
<h1>transparent</h1>
<p>Quickly make background color transparent.</p>
<p>This app grab color of top left corner pixel as reference & turn opacity of every pixel that has same color to 0. (note: this is not perfect ! I'm using this tool to prep base image for my <a href="https://twitter.com/kosamari/status/718966165607948288" title="">code annotation</a>.)</p>
<p>Made by <a href="https://twitter.com/kosamari">@kosamari</a>. Code on <a href="https://github.com/kosamari/transparent">github</a>.</p>
<input type="file" name="file" id="input" accept="image/*" onchange="loadImage(this.files)" >
<label for="input">Choose an image</label>
<div id="drop-target">... or Drag an image here</div>
<div id="message" hidden></div>
<button id="download" hidden>Download</button>
<div id="result"></div>
<a id="a" hidden></a>
</div>
<script >
if (navigator.serviceWorker) {
navigator.serviceWorker.register('/transparent/sw.js', {scope: '/transparent/'})
}
var $target = document.getElementById('drop-target')
var $download = document.getElementById('download')
var $message = document.getElementById('message')
var $result = document.getElementById('result')
var $download = document.getElementById('download')
var $a = document.getElementById('a')
var canvas = document.createElement('canvas')
var ctx = canvas.getContext('2d')
var imageData, imageFile, filename
var worker = new Worker('worker.js')
var reader = new FileReader()
var image = new Image()
function loadImage (src) {
$message.hidden = false
$message.textContent = 'Processing...'
$result.innerHTML = ''
reader.readAsDataURL(src[0])
filename = src[0].name.split('.')[0]
}
reader.onload = function () {
// Create new Image in memory for canvas to use
image.src = reader.result
// Wait for the Image to load
image.onload = function () {
// Setup Canvas & draw image onto it
canvas.width = this.width
canvas.height = this.height
ctx.drawImage(this, 0, 0)
imgData = ctx.getImageData(0,0, canvas.width, canvas.height)
var data = {img:imgData, color: [imgData.data[0],imgData.data[1],imgData.data[2]]}
worker.postMessage(data, [data.img.data.buffer])
worker.onmessage = function (message) {
var newimg = message.data
ctx.putImageData(new ImageData(newimg.data, newimg.width, newimg.height), 0, 0)
$message.hidden = true
// make an image element and append result div
var resultImg = document.createElement('img')
resultImg.src = canvas.toDataURL('image/png')
resultImg.width = $target.offsetWidth
// $result.appendChild(resultTitle)
$result.appendChild(resultImg)
$download.hidden = false
}
}
}
function downloadFile () {
// Create Download Link
canvas.toBlob(function (blob) {
// Check if image file was made previously & remove
if (imageFile !== null) {
window.URL.revokeObjectURL(imageFile)
}
imageFile = window.URL.createObjectURL(blob)
$a.download = filename + '-transparent.png'
$a.href = imageFile
$a.click()
}, 'image/png')
}
$download.addEventListener('click', downloadFile)
// $download.addEventListener('touchstart', downloadFile)
// event listener for drag and drop area
$target.addEventListener('dragover', function (e) {
e.preventDefault()
$target.textContent= 'Drop it!'
$target.style.border = 'solid 2px gray'
}, true)
$target.addEventListener('drop', function (e) {
e.preventDefault()
$target.textContent= 'Drag an image here'
$target.style.border = 'dashed 2px gray'
loadImage(e.dataTransfer.files)
}, true)
// toBlob Polyfill
if (!HTMLCanvasElement.prototype.toBlob) {
Object.defineProperty(HTMLCanvasElement.prototype, 'toBlob', {
value: function (callback, type, quality) {
var binStr = atob(this.toDataURL(type, quality).split(',')[1])
var len = binStr.length
var arr = new Uint8Array(len)
for (var i = 0; i < len; i++) {
arr[i] = binStr.charCodeAt(i)
}
callback(new Blob( [arr], {type: type || 'image/png'}))
}
})
}
</script>
</body>
</html>