@java.lang.Override
    public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
      if (java.lang.Double.doubleToRawLongBits(saturation_) != 0) {
        output.writeDouble(1, saturation_);
      }
      if (java.lang.Double.doubleToRawLongBits(contrast_) != 0) {
        output.writeDouble(2, contrast_);
      }
      if (java.lang.Double.doubleToRawLongBits(brightness_) != 0) {
        output.writeDouble(3, brightness_);
      }
      getUnknownFields().writeTo(output);
    }
<pre>
Control brightness of the video. Enter a value between -1 and 1, where -1
is minimum brightness and 1 is maximum brightness. 0 is no change. The
default is 0.
</pre>

<code>double brightness = 3;</code>

@return The brightness.
java-video-transcoder/proto-google-cloud-video-transcoder-v1/src/main/java/com/google/cloud/video/transcoder/v1/PreprocessingConfig.java