title: Highcharts : smooth / anti-aliasing line
body: <p>I use a basic line chart from highcharts library and I think that the lines are not smooth enough. </p>
  
  <p>It's possible to improve it ?</p>
  
  <p>My code :</p>
  
  <pre><code>    chart: {
              type:'line',
              renderTo: 'issues_by_release',
              plotBackgroundColor: null,
              plotBorderWidth: null,
              plotShadow: false
              },
      yAxis: { 
              min:0,
              labels:{ enabled:true },
              title: {
                       text:'Issues'
                     }                          
             },
      xAxis: {
              tickmarkPlacement: 'on',    
              tickLength:10,  
              categories:['1','2','3','4','5'],
              labels:{ rotation:-45, 
                       align:'right'
                     }                           
              },
      plotOptions: {
                      line: {                            
                              dataLabels: {
                                              enabled: true                                                    
                                          },
                              enableMouseTracking : false,
                              showInLegend: true
                          }                        
                      },                                
                      series: [{
                              type: 'line',                           
                              name: 'Testers', 
                              data: [1,2,3,4,5]                                                           
                              }                           
                              ]
              });
          });
  </code></pre>
  
  <p>Thank you  in advance !</p>