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                            增強圖形信息的一種手段

  ~~~
   <defs>
        <filter id="id名" x="0" y="0" width="100%" height="100%" filterUnits="userSpaceOnUse">
          濾鏡基元
        </filter>
      </defs>
~~~

尺寸默認值：x等于-10%、y等于-10%、width等于120%、height等于120%；即filterUnits="objectBoundingBox"

如果需要自己設定邊界，需要設置filterUnits="userSpaceOnUse"，否則沒用

濾鏡基元：

feGaussianBlur：高斯模糊--制作陰影

feColorMatrix：顏色矩陣

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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