loadImageFromDevice(event) {
      if (!event.target.files[0]) return;
      let file = event.target.files[0];
      //read as blob and create local object URL for it:
      let blobReader = new FileReader();
      blobReader.readAsArrayBuffer(file);
      blobReader.onload = () => {
        let blob = new Blob([new Uint8Array((blobReader.result as ArrayBuffer))]);
        let blobURL = URL.createObjectURL(blob);
      };
      // read as base64 image:
      let dataReader = new FileReader();
      dataReader.readAsDataURL(file);
      dataReader.onload = () => {
        let dataURL = dataReader.result;
      };
      dataReader.onerror = (error) => {
        this.foundation.handleError(error);
      };
  };