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index.html
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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>PolyPNG by zcyzcy88 | 点击就变图片生成器</title>
<style type="text/css">
body {
line-height: 1.5;
transition: background-color 0.5s;
}
p {
max-width: 500px;
padding: 5px 20px;
background-color: rgba(255, 255, 255, 0.6)
}
img {
max-width: 400px;
height: auto;
margin: 50px;
}
</style>
</head>
<body>
<p>
<a href="http://tieba.baidu.com/p/3879783064">
原教程和原理<br />
Origin and principle
</a>
</p>
<p>
<a href="https://github.com/zcyzcy88/PolyPNG">
源代码<br />
Source Code
</a>
</p>
<br />
<p>
选择图片，点击生成，右键保存。<br />
Chose images, chick "Create" button, save image by right-click.
</p>
<p>
生成的图片尺寸是图片1的尺寸。<br />
The size of created image is same as Image 1.
</p>
<br />
<p>
<label>
图片1（较亮）/ Image 1 (light)：<br />
<input id="input1" type="file" accept="image" onchange="load1();">
</label>
</p>
<p>
<label>
图片2（较暗）/ Image 2 (dark)：<br />
<input id="input2" type="file" accept="image" onchange="load2();">
</label>
</p>
<br />
<p>
<button onclick="run();"> 生成 / Create </button>
<button onclick="toggle();"> 切换背景颜色 / Toggle background color </button>
</p>
<img id="output" />
<script type="text/javascript">
'use strict';
var img1 = document.createElement('img')
var img2 = document.createElement('img')
function load1() {
var reader = new FileReader()
reader.onload = function () {
img1.src = reader.result
}
reader.readAsDataURL(input1.files[0])
}
function load2() {
var reader = new FileReader()
reader.onload = function () {
img2.src = reader.result
}
reader.readAsDataURL(input2.files[0])
}
function run() {
// create context
var c = document.createElement('canvas')
c.width = img1.width
c.height = img1.height
var ctx = c.getContext("2d")
// get data
ctx.drawImage(img1, 0, 0)
var data1 = ctx.getImageData(0, 0, c.width, c.height) //一维数组
ctx.drawImage(img2, 0, 0, c.width, c.height)
var data2 = ctx.getImageData(0, 0, c.width, c.height)
// create blank data
var data3 = ctx.createImageData(c.width, c.height)
// process
var i = 0
var len = data1.data.length
var R1, G1, B1, avg1 // light
var R2, G2, B2, avg2 // dark
var R3, G3, B3, A3 // output, A is alpha
for (; i < len; i += 4) {
// oho, interval question，0~255 or 0~1?
R1 = data1.data[i + 0] // 0~255
G1 = data1.data[i + 1] // 0~255
B1 = data1.data[i + 2] // 0~255
avg1 = (R1 + G1 + B1) / 3 // 0~255
R2 = data2.data[i + 0]
G2 = data2.data[i + 1]
B2 = data2.data[i + 2]
avg2 = (R2 + G2 + B2) / 3
A3 = avg2 - avg1 + 255 // 0~255
if (A3 === 0) {
A3 = 0.0001
}
R3 = R2 * 255 / A3 // equal to R2 / A3 * 255
G3 = G2 * 255 / A3
B3 = B2 * 255 / A3
data3.data[i + 0] = R3
data3.data[i + 1] = G3
data3.data[i + 2] = B3
data3.data[i + 3] = A3
}
// save
ctx.putImageData(data3, 0, 0)
output.src = c.toDataURL("image/png")
}
var black = false
function toggle() {
if (black) {
document.body.style.backgroundColor = "#FFF"
} else {
document.body.style.backgroundColor = "#000"
}
black = !black
}
</script>
</body>
</html>