CSS/jQuery：灰色jQuery循環彩色圖像幻燈片

我有很多幻燈片顯示每個項目。我想讓所有未選擇的幻燈片顯示爲灰色（不僅可以淡化它們的不透明度，也可以在它們上面覆蓋乳白色覆蓋層，我可以做到這一點），使當前選定的幻燈片在視覺上脫穎而出。它應該在當前的webkit瀏覽器上運行，並從IE8向上運行。我試圖與畫布合作將它們變灰，但它會打破我網站上的幻燈片和其他內容。有沒有另一種方法通過CSS & jQuery灰化圖像/幻燈片？CSS/jQuery：灰色jQuery循環彩色圖像幻燈片

如果只是這樣-webkit-filter: grayscale(100%);會在Safari，Chrome瀏覽器，Firefox和IE瀏覽器> = 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>

來源

2012-08-13 Systembolaget