Angular 使用jsPDF生成带有图像的PDF时出现灰色条纹

我必须生成一个PDF文件与我的Angular 组件的视图.我使用domtoimage将组件呈现为PNG图像，使用jsPDF将生成的图像添加到PDF.

But in rendered PDF I noticed some gray stripes (the half of the text was hidden because it's a special effect in my application, it's not a bug):

它们不存在于我截图的原始组件中.

如何go 除这些条纹？

以下是我生成PDF的代码:

openPDF(): void {
    this.generatingPDF = true;
    const DATA = this.textContainerRef.nativeElement!;

    domtoimage
      .toPng(DATA)
      .then((png) => {
        const w = DATA.clientWidth;
        const h = DATA.clientHeight;
        const hpng = (h / w) * 190;
        const doc = new jsPDF('p', 'mm', 'a4');
        try {
          let name = 'untitled_text';
          if (this.text?.title) {
            name = this.text.title;
          }
          doc.addImage(png, 'png', 10, 10, 190, hpng, 'SLOW').save(name);
          this.generatingPDF = false;
          this._cdr.markForCheck();
        } catch (e) {
          this.generatingPDF = false;
          this._cdr.markForCheck();
        }
      })
      .catch((err) => console.log(err));
  }