此效果可以生成高分辨率的图像
            
               说明
            Light drawing is a fancy photographic technique in which exposures are made by moving a hand-held light source while taking a long exposure photograph. With this effect you can write a short text in this manner.         
         




 
                
                
                
                
   
   
    
   
   
    
   
   
    
   
   
    
   
   
    
   
   
    
   
   
   