img 黑白版与彩色版切换
Posted 绮梦璇玑
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function converttoGS(img) {
img.color = img.src;
img.grayscale = createGSCanvas(img);
img.onmouseover = function () {
this.src = this.color;
}
img.onmouseout = function () {
this.src = this.grayscale;
alert(this.src)
}
}
function createGSCanvas(img) {
var canvas = document.createElement(‘canvas‘);
canvas.width = img.width;
canvas.height = img.height;
var ctx = canvas.getContext(‘2d‘);
ctx.drawImage(img,0,0);
var c = ctx.getImageData(0,0,img.width,img.height);
for(var i = 0; i <c.height;i++){
for(var j = 0; j<c.width; j++){
var x = (i*4)*c.width+(j*4);
var r = c.data[x];
var g = c.data[x+1];
var b = c.data[x+2];
c.data[x] = c.data[x+1] = c.data[x+2]=(r+g+b)/3;
}
}
ctx.putImageData(c,0 ,0,0,0,c.width,c.height)
return canvas.toDataURL();
}
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