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我想用jQuery改變圖像的R,G,B顏色。我將圖像轉換爲畫布,但它不起作用請修復我的錯誤或我錯過了什麼。使用jquery更改圖像的R,G,B?
這次我只是改變紅色,如果這個作品休息可以做到相同。
這裏是我的代碼
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<script type="text/javascript" src="js/jquery-1.8.3.js"></script>
<script type="text/javascript">
function redSwitch() {
var canvas = document.createElement('canvas');
var ctx = canvas.getContext('2d');
var photo = new Image();
photo.src = $('#pic').attr('src');
canvas.width = photo.width;
canvas.height = photo.height;
ctx.drawImage(photo, 0, 0);
var imgPixels = ctx.getImageData(0, 0, canvas.width, canvas.height);
var val = $('#red').val();
for(var y=0; y<imgPixels.height; y++)
{
for(var x=0; x<imgPixels.width; x++)
{
var i = (y * 4) * imgPixels.width + x * 4;
if(imgPixels.data[i]+val > 255)
{
imgPixels.data[i] = 255;
}
else
{
imgPixels.data[i] = imgPixels.data[i]+val;
}
}
}
}
$(document).ready(function(){
$('#red').change(function(){
redSwitch();
});});
</script>
</head>
<body>
<img id="pic" src="pool.jpg" />
<input type="range" id="red" min="-255" max="255" value="0" />
</body>
</html>