public setCellImage(rowStart: number, columnStart: number, rowEnd: number, columnEnd: number, base61Image: string, extension: string) {
    const image = this.workbook.addImage({
      base64: base61Image,
      extension: extension,
    });

    const imageElement = new Image();
    imageElement.src = base61Image;
    const imageWidth = imageElement.width;
    const imageHeight = imageElement.height;
    const areaWidthInPixels = (columnEnd - columnStart + 1) * 64;
    const areaHeightInPixels = (rowEnd - rowStart + 1) * 20;

    // resized to area width
    let imageResizedWidth = areaWidthInPixels;
    let imageResizedHeight = imageHeight / imageWidth * imageResizedWidth;
    if (imageResizedHeight > areaHeightInPixels) {
      // resized to area height if resizedHeight still bigger than the area
      imageResizedHeight = areaHeightInPixels;
      imageResizedWidth = imageWidth / imageHeight * imageResizedHeight;
    }

    const imagePosition = {
      tl: { col: columnStart - 1, row: rowStart - 1 },
      ext: { width: imageResizedWidth, height: imageResizedHeight }
    };

    this.sheet.addImage(image, imagePosition);
  }