javascript - 如何提高 videojs-record 中 exportImage() 函数截取的屏幕截图质量

Question

// 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截图（整个窗口）的代码，但是我从这个函数获取的图像中显示的质量非常低， 有人可以帮我提高它的质量。使用的库：https ://collab-project.github.io/videojs-record/#/