如何提高videojs-record中exportImage()函数截取的截图质量

如何解决如何提高videojs-record中exportImage()函数截取的截图质量

// video.js configuration
    this.config = {
      controls: false,bigPlayButton: false,loop: false,width: 640,height: 480,fluid: false,plugins: {
          record: {
              screen: true,image:true,maxLength: 30,displayMilliseconds: false,debug: true,}
      } 
    };
async getVPDetails(): Promise<any> {
    return await this.player.record().exportimage('image/png',1);
  }
  takeScreenshot(){
      this.getVPDetails().then(data => {
          var unsafeImageUrl = URL.createObjectURL(data);
          this.imageData = this.sanitizer.bypassSecurityTrustUrl(unsafeImageUrl);
      },error => {
          console.log(error);
      
      });
  }

这是我用来截取屏幕（整个窗口）屏幕截图的代码，但质量非常低showed in the image i have took from this function 有人可以帮我提高它的质量吗？ 使用的库：https://collab-project.github.io/videojs-record/#/