Tensor to JPEG: Improve quality

I'm converting a tensor returned from a tensorflow camera into a jpeg. I've been able to do so but the jpeg image quality is terrible. This is for a mobile react-native app developed with expo. The library I'm using to convert the tensor to an image is jpeg-js.

This is the code I'm using to transform the tensor into an image:

const handleCameraStream = async (imageAsTensors) => {
  const loop = async () => {
    const tensor = await imageAsTensors.next().value;
    console.log(tensor)
    const [height, width] = tensor.shape
    const data = new Buffer(
      // concat with an extra alpha channel and slice up to 4 channels to handle 3 and 4 channels tensors
      tf.concat([tensor, tf.ones([height, width, 1]).mul(255)], [-1])
        .slice([0], [height, width, 4])
        .dataSync(),
    )

    const rawImageData = {data, width, height};
    const jpegImageData = jpeg.encode(rawImageData, 200);

    const imgBase64 = tf.util.decodeString(jpegImageData.data, "base64")
    const salt = `${Date.now()}-${Math.floor(Math.random() * 10000)}`
    const uri = FileSystem.documentDirectory + `tensor-${salt}.jpg`;
    await FileSystem.writeAsStringAsync(uri, imgBase64, {
      encoding: FileSystem.EncodingType.Base64,
    });
    setUri(uri)
    // return {uri, width, height}
  };
  // requestAnimationFrameId = requestAnimationFrame(loop);
  !uri ? setTimeout(() => loop(), 2000) : null;
}

The picture in the top half of the image is the camera stream. The picture in the bottom half of the image below is the transformed tensor.