將彩色圖片轉換爲黑白

1. 不同的瀏覽器將彩色圖片顯示爲黑白圖片的css，這裏採用css filter

• firefox

img {
    filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\' x=\'0\' y=\'0\' width=\'100%\' height=\'100%\'><feColorMatrix type=\'matrix\' values=\'0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0\'/></filter></svg>#grayscale");
}
img:hover{
    filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\' x=\'0\' y=\'0\' width=\'100%\' height=\'100%\'><feColorMatrix type=\'matrix\' values=\'1 0 0 0 0,0 1 0 0 0,0 0 1 0 0,0 0 0 1 0\'/></filter></svg>#grayscale");
}

 

•  IE

img{ 
   
    -webkit-filter: grayscale(100%);
    -moz-filter: grayscale(100%);
    -ms-filter: grayscale(100%);
    -o-filter: grayscale(100%);    
    filter: grayscale(100%);	
    filter: gray;
}
img:hover {
    -webkit-filter: grayscale(0);
    -moz-filter: grayscale(0);
    -ms-filter: grayscale(0);
    -o-filter: grayscale(0);    
    filter: grayscale(0);	
}

 

2.  根據不同的瀏覽器加載不同CSS

 

<script>
if(window.navigator.userAgent.indexOf("MSIE")>=1){
  //如果瀏覽器爲IE
  setActiveStyleSheet("style_ie.css");
}
else if(window.navigator.userAgent.indexOf("Firefox")>=1 ){
  //如果瀏覽器爲Firefox
  alert("fire");
  setActiveStyleSheet("style_fire.css");
}
else{
  //如果瀏覽器爲其它
  setActiveStyleSheet("style_ie.css");
}
   
 function setActiveStyleSheet(filename){ 
  document.write("<link href=\".\/cs\/"+filename+"\" type=\"text\/css\" rel=\"stylesheet\">");
}
</script>

 後記：

可以直接通過CSS實現，經過測試在firefox上是好使的，IE上不知道爲什麼，變不回彩色了。

	<style type="text/css">
	img{ 
   
    -webkit-filter: grayscale(100%);
    -moz-filter: grayscale(100%);
    -ms-filter: grayscale(100%);
    -o-filter: grayscale(100%);    
    filter: grayscale(100%);	
	filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\' x=\'0\' y=\'0\' width=\'100%\' height=\'100%\'><feColorMatrix type=\'matrix\' values=\'0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0\'/></filter></svg>#grayscale");
	filter: progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);
}
	img:hover{
		-webkit-filter: grayscale(0);
		-moz-filter: grayscale(0);
		-ms-filter: grayscale(0);
		-o-filter: grayscale(0);    
		filter: grayscale(0);	
		filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\' x=\'0\' y=\'0\' width=\'100%\' height=\'100%\'><feColorMatrix type=\'matrix\' values=\'1 0 0 0 0,0 1 0 0 0,0 0 1 0 0,0 0 0 1 0\'/></filter></svg>#grayscale");
		filter: progid:DXImageTransform.Microsoft.BasicImage(grayscale=0);
	}
	</style>