CSS/jQuery：灰色jQuery循环彩色图像幻灯片

我有很多幻灯片显示每个项目。我想让所有未选择的幻灯片显示为灰色（不仅可以淡化它们的不透明度，也可以在它们上面覆盖乳白色覆盖层，我可以做到这一点），使当前选定的幻灯片在视觉上脱颖而出。它应该在当前的webkit浏览器上运行，并从IE8向上运行。我试图与画布合作将它们变灰，但它会打破我网站上的幻灯片和其他内容。有没有另一种方法通过CSS & jQuery灰化图像/幻灯片？CSS/jQuery：灰色jQuery循环彩色图像幻灯片

如果只是这样-webkit-filter: grayscale(100%);会在Safari，Chrome浏览器，Firefox和IE浏览器> = 8 ...

<script type="text/javascript"> 
$(window).load(function(){ 

    $('.item img').each(function(){ 
     var el = $(this); 
     el.css({"position":"absolute"}).wrap("<div class='img_wrapper' style='display: inline-block'>").clone().addClass('img_grayscale').css({"position":"absolute","z-index":"998","opacity":"0"}).insertBefore(el).queue(function(){ 
      var el = $(this); 
      el.parent().css({"width":this.width,"height":this.height}); 
      el.dequeue(); 
     }); 
     this.src = grayscale(this.src); 
    }); 

    $('.item img').mouseover(function(){ 
     $(this).parent().find('img:first').stop().animate({opacity:1}, 1000); 
    }) 
    $('.img_grayscale').mouseout(function(){ 
     $(this).stop().animate({opacity:0}, 1000); 
    });  
}); 

function grayscale(src){ 
    var canvas = document.createElement('canvas'); 
    var ctx = canvas.getContext('2d'); 
    var imgObj = new Image(); 
    imgObj.src = src; 
    canvas.width = imgObj.width; 
    canvas.height = imgObj.height; 
    ctx.drawImage(imgObj, 0, 0); 
    var imgPixels = ctx.getImageData(0, 0, canvas.width, canvas.height); 
    for(var y = 0; y < imgPixels.height; y++){ 
     for(var x = 0; x < imgPixels.width; x++){ 
      var i = (y * 4) * imgPixels.width + x * 4; 
      var avg = (imgPixels.data[i] + imgPixels.data[i + 1] + imgPixels.data[i + 2])/3; 
      imgPixels.data[i] = avg; 
      imgPixels.data[i + 1] = avg; 
      imgPixels.data[i + 2] = avg; 
     } 
    } 
ctx.putImageData(imgPixels, 0, 0, 0, 0, imgPixels.width, imgPixels.height); 
return canvas.toDataURL(); 
}  
</script>

来源

2012-08-13 Systembolaget